OP... The most important thing NOW is what Mom thinks about this situation and what she is willing to do about it. And something needs to be done NOW. Because if kiddo wants to go to college directly from HS? Junior year is crucial. All is not lost, though... If *I* were Mom... I would do a few things:
1. Speak with the school and withdraw kiddo ASAP. She should end up with Incompletes for the term.
2. Find out what is needed for her to complete the term w/passing grades(i.e. Can she take online classes? What about summer school? Online or in-person? Mine had to retake a class spring of her Senior year - a full semester course took her 3 weeks online, and that was while she was going to school, playing a sport, etc.)
3. Bully the psych to see kiddo AT LEAST weekly,
4. Start family therapy for all three of you.
5. Start serious one-on-one time with kiddo.
Just what I would do.