Officially, breastfeeding is encouraged. Everybody talks it up. Even the cans of formula say “breast is best”.  But the reality is, there’s a learning curve for both mother and child…I mean, kids are born knowing they want to suckle (with a few exceptions), but quite often their technique needs help.  Plus, if mom is new at it, and especially if she’s recovering from cesarean surgery or a traumatic vaginal delivery…geez, it can be tough.
I know with #4, even though I knew what I was doing, I still wound up with injured nipples by day 2 and a crack at the base of one by day 4.  It took 35 days to heal that crack, and let me tell you that the IBCLC ‘board certified lactation consultants’ were less help to me than the ladies at the usenet group who had been there and done that…personally. There were feedings (many many) that took every bit of courage I had to face the Gaping Maw, knowing how bad latch-on would hurt. BUT I had this advantage: I knew I could do it. I had done it before. I knew what a good latch looked and felt like, I knew how to tell when baby was transferring milk properly, and I knew when there was a problem requiring actual medical attention (mastitis, etc - which I also got on day 4).  Most of all, I knew that the pain was transitory, and that I could survive it, and that it would (eventually) get better.  But I had a lot of advantages there, not to mention a very supportive, sympathetic husband. And I wanted it very badly. That factors in also.
But let me tell you what ‘support’ is not:  It’s not: “Breast is best, but your baby is too big/too small/not in the 90th percentile/only gaining 1/2 oz a day/not sleeping through the night at 6 weeks, so supplement with formula”.
It is not “Gee, honey, whatever you want, that’s great by me.” Because at 4 in the morning, when you’re so tired you can’t see straight and you can’t get the blinking baby to latch on and she’s screaming and you’re crying and your husband is snarling at having been woken up again…that bottle of ready-to-feed formula the hospital sent home with you, or your mom brought over ‘just in case’…looks pretty good.
For *some * babies, and *some * moms, all it takes is just one bottle. One bottle to make the baby unwilling to work for his supper at the breast. One bottle to send mom’s supply (which responds to demand) into a downward spiral.
Support, true support, is multifaceted: it’s real people who will call back and just listen, and encourage, and go in person and look at a baby’s latch and help correct it.  It’s advice about herbs and foods that help increase the milk supply, and maybe the suggestion of a sling to carry baby so mom can nurse hands-free for a little while.  It’s reassurance that yes, it’s within the range of normal for a 4 months old to suddenly refuse the breast, and here’s what you can try to get them to nurse; that it’s normal for babies to chomp sometimes, and here are ways to teach them not to.  It’s fathers and partners who will get up in the middle of the night and bring the nursing mom a glass of water and a snack, who tell her what a good job she’s doing, and who do not start bullying her to wean at some preconceived time when neither mom nor baby are ready.  It’s helping a mom know when there really is a need to supplement, because that happens too.  It’s even smiling at the woman who’s nursing in public, and giving her a thumbs-up for her courage.
Now, my firstborn got sent to my room with a pacifier shoved in her mouth, which she had been given to - I suspect - shut her up, when they were trying to “let me sleep” even though I’d asked them to bring her to me when she got hungry.  (My twins went to NICU and their story is different. You can bet my youngest never left my hospital room, I wasn’t letting her out of my sight.)  Since I know that my firstborn’s latch got bad if she had a pacifier very often, I wonder now if our initial experience would have been better if she had not been given that pacifier, which I told them not to give her. I don’t know.  I have had those horror nights with the 3 week old baby screaming and all that…and thrush on top of it…and the idiot doctor giving me bad advice.  But I was lucky: my perseverence was able to pay off. Many women do not succeed despite the same level of perseverence. And some are persuaded not to persevere, even though they say they want to, by well-meaning friends/family/medical personnel.
And of course, some women never want to breastfeed, or try it and find it too much a challenge, and to those I say: please just say so. Please don’t make the excuses: Oh, my breasts were too big/too small, my nipples were the wrong shape, my milk didn’t come in by day 2 so I just switched to formula, I have to go back to work in 8 weeks, I couldn’t survive without my sleep…these are excuses, but other women hear them and believe them, and think they’re truths. And these “truths” undermine women who want to do it, and want to succeed.  If you want to feed formula? Do. It’s an adequate source of nutrition for most babies. But realise the impact of your words. Hell, it’s like telling pregnant women how horrible labor will be. It does them no favors, and sets them up for fear and negative expectations.
I had difficult, challenging initial breastfeeding experiences which, with effort and patience and perseverence I was able to overcome. I went on to have very satisfactory nursing experiences, and am still very pleased to be feeding my 12 month old daughter. I will feed her until she chooses to wean.  I think most women can have this story, or even a better story…with adequate support. Our culture doesn’t generally provide that, but that’s something many of us are working on…more subtly than the OP’s woman with her nurse-in.