Working at a nice restaurant might work. She could only work Fridays and Saturdays and still make a pretty good living without taking any work home. Balancing school and work can be very difficult, but if she can work with a therapist to help with time management, it may be doable.
I too was diagnosed with ADHD, anxiety, and depression at 21! It’s such an empowering realization. It takes some time, but things do get better from here! 🙂