How to help sibling struggling with mental health issues

So in highschool agter I moved away my younger sister started dealing with what would later turn into depression, and body dysmorphia. Our mom never took any of the small cries for help seriously and assumed it was just “teenage overreacting”. Plus our mom was insanely overprotective in highschool and it caused us both to have bad relationships with her that only got better after we each moved out.

I only found out that she really had issues a year and a half ago when I friend she was sleeping with sent me their texts where she was really needing help. I woke up one morning and just drove her to the doctor. She was diagnosed with depression and started taking some medication which helped for a while. Also her group therapy sessions really helped. But now she’s getting to a bad place again. Doctor visits are free cause we live in Canada, and the mess aren’t even that much but for her they are. She just hates me paying for things. And $30 a month is a lot for someone working part time minimum wage.

She also makes pretty bad financial decisions like borrowing $1600 fo m me for a dance trip to Brazil. She goes out drinking and clubbing way more than I do.

Basically she barely makes any money because this is her third year in an unpaid intensive dance program. I’ve offered to pay for group therapy and she won’t accept it. She just going into a spiral of feeling bad because we’re all trying to pay for her but she owes money to a bunch of me and our friends.

It’s just exhausting, I work 15+ hour days 5 days a week in the film industry which already takes up so much of my time and energy. I’m like and tired and am kind of stuck with what to do.

I don’t want her to be angry for bringing my mom into it, but I don’t know what to do anymore. Me and our friends clearly aren’t getting her the help she needs. I feel like my mom might be more understanding now, but I can’t be 100% sure.

I kind of needed to let this all out, any thoughts?