Sounds like a situation that needs to be turned around, quickly. However - she's the only one who can do it. Offer advice and a sympathetic ear, not necessarily in that order, and make sure she keeps you posted.
Her housing and auto costs are pretty low for LA, so that's promising. Give her a copy of "Your Money or your Life" which talks about gazingus pins - she'll recognize that pretty quickly as shoes are mentioned specifically as an example!
Also does she have any retirement savings at all? If not, she's behind the 8 ball there, too (and btw she should not raid her account).
So, there are things she can do Right Now and also some out of the box ideas that she needs to strongly consider. For Right Now:
- If she's paying $1100/mo for student loan interest on a $135K balance, that's a 10% rate. Yowza. Can that be refinanced? You can help her do online research for this.
- I know you said low credit score, but there are tricks to reduce the interest on her credit card debt: call the bank and negotiate for a lower rate, get a card with an introductory 0% rate and roll the highest interest debt onto it, go to her local bank or credit union and ask about personal loans. Also, there are agencies in LA that can help to manage credit card debt for a small fee that may be worth it for her.
- YNAB. Even given the price tag, she needs this BADLY. It would be a nice gift if you want to stake her to the first year. The fact that it costs $$ will give her extra impetus to make good use of it.
- If it's allowed, list the studio on Airbnb at least for times when she's not home; crashing with friends or family to increase the rental income is another possibility.
Then, she should take a step back and consider her situation. Given her age and education she's earning a crappy income in a HCOL area in a go-nowhere time-sucking job. What does she teach, and what was her degree in? She needs some better options, and there have to be some. Most of them probably involve moving out of LA. Look for jobs in "underserved areas" that come with student loan forgiveness, for a start.