Sorry to hear about your mother's passing. My grandma has dementia right now and I know how hard it is to see someone deteriorate like that. My grandma is close to passing.
What's happening to your daughter definitely sounds scary. I your daughter gets the answers and medical help she needs.
Have you ever considered the idea of getting free therapy? Some universities offer free or low cost therapy to help train their students, or they offer free therapy in exchange for participating in a research study.
I know I was offered free therapy for participating in an anxiety study. I did have to do an interview to participate, but I ultimately didn't qualify because my anxiety issues didn't match what they were analyzing. But hey, you can get free money in general from research studies, and you can use that money toward therapy