I had a Medela Lactina (rental-grade) and am not all that familiar with the current models so I can’t advise there.
The idea of a handsfree option is a good one. Back when I was in the dairy business, the only handsfree choice was to buy a specially-made bra, with hooks into which you attached rubber bands, which held on special clips, that held the “funnel” part of the pump in place. It was a pain, it didn’t work all that smoothly, and I think I used it twice. I did get fairly good at doing both sides at once one-handed, though there tended to be some leakage.
So - if the technology has improved, I’d definitely be willing to spring for it!
Re supply: I would suggest she start pumping a few times a day ASAP simply to a) get used to pumping, b) ramp up her milkmaking apparatus.
It can be hard for some mothers to pump enough during the workday to replace the milk the baby will be drinking during the following workday. Between not having time, the pump not doing the job as well as the baby, the stress impeding letdown, etc., though of course her experience may vary. I personally found that if I had plenty of time to pump, total volume wasn’t a problem; I was envious of those women who claimed they could empty a breast in 5 minutes.
Anyway - I’m not saying “xxx bottles saved up in the freezer”, but if she starts pumping a couple of times a day, after feeding the baby, that’ll increase her ongoing supply, as well as building up a backlog in the freezer for those low-supply days later on. I want to say I had a couple of dozen bottles in the freezer when I went back to work (I know I wound up having to THROW SOME AWAY, as horrible as that sounds, as it was stuff from early weeks and she was refusing it… she may not have liked the taste of the Special Preemie Blend).
If your baby is not used to taking a bottle at all, start working on this now or in the near future - I’m not sure how old baby is but the general advice is try the occasional bottle once breastfeeding is well established - 4-6 weeks or so. If mom goes back to work and baby refuses the bottle at daycare, well that’s a whole additional stressor. They generally figure things out after a few days, but some are frankly stubborn as hell about it.