Yeah, forget consolidation. The best candidates for consolidation are those who rack up high interest rate debt, yet have a major asset like a home they can use to secure a single loan at a much lower interest rate.
From a return on money standpoint, the best plan is to pay down the cards with the highest interest first, and pay the minimum on everything else. Once the highest card is paid off, start paying off the next highest. And so on. Maintaining a savings account makes no sense, because you’re carrying debt at a higher interest rate as your savings. And it doesn’t even make sense as an ‘emergency’ fund, since paying down your credit card means you have some headroom on the card for an ‘emergency’.
But that’s just the mathematical side. There may be behavioral reasons to use other approaches, but they are going to be different for each person.
The key to the whole venture is to break the habits that led to the big debt in the first place. Your cousin needs to avoid the trap of ‘slipping’ and choosing just to pay the minimums one month so that she can ‘take a break’ and ‘treat herself’ or something. She’s become accustomed to a certain lifestyle that can’t be maintained - the only way to permanently fix the situation is to develop a new lifestyle, and that means totally reprogramming your expectations of what you can afford.
Also, it might not be useful to go completely nuts about repayment - to the point of hardship. Some people can do that, and others can’t. A better plan might be to work out a reasonable payment scheme like 30% of her takehome pay. Set up an auto-payment at the bank to automatically remove it, if possible, so she never even sees the money. That might be hard with many credit cards to pay, but at least she could have the money moved into a ‘debt payment account’ that she uses to pay down the cards. That way it’s not in ‘general revenue’ and it takes a more explicit act to spend that money rather than use it to pay debt.
Once she’s done that, she should make a serious effort to learn how people on her ‘new’ income live - how much they spend on clothes and food, how often they eat out, what kind of car they have, etc. She needs to recalibrate her thinking around her new means - forget the $200 jeans and $500 handbags, and learn to enjoy cheaper items. That sort of thing.
Finally, avoid the trap of ‘waiting’ for that big inheritance to get her out of trouble. I’ve seen that behavior before too. She should instead develop the attitude that she’s going to try to pay down enough of the debt that the inheritance will put her over the top, free and clear.
And cut up all the cards except the one with the best rate. That way she won’t backslide and start removing the little amounts of headroom from each card when she ‘needs’ the extra money. If she’s only got one card left, the worst she can hurt herself is by maxing out just that one.
The other thing she can do to minimize the pain is to tell herself that every raise she gets from now until the debt is paid will go straight to her credit cards. And every bonus. As soon as she gets a raise and gets her first cheque, she should contact the bank and raise her auto-transfer to her debt payment account by the identical amount. Then her lifestyle is maintained, but she speeds up her debt service.