Lot of negative Thoughts & anger.

My daughter is constantly worrying about one thing or other. Sometimes she thinks she can't have a career & sometimes she thinks nobody will marry her. Mostly she has two moods in a day - one she is causing her family pain & second she is having pain due to family. Both are too repetitive. She is scared of taking any help from the doctors as she's terrified of medications. Her thoughts lead her to conclusuons like running away from home, getting married to anyone, going no contact with her loved ones as she feels she worry about the family a lot. We have to support every irrational decision of hers because she gets really angry on hearing anything else than supporting her decisions.Also she is terrified to live alone What to do, I feel so helpless.