My 21 Year Old Daughter Has Not Had A Hair

My 21 year old daughter has not had a hair cut in over 5 years. Her hair is shrinking and thinning. She has had blood tests for thyroid issues and other deficiencies and nothing has explained the problem. She just sent me a pic and her hair is shorter than 2 weeks ago. It is to her chin/cheeks. She is depressed and frustrated. It does not fall out in clumps...just breaking at ends we think. She feels like she looks like a boy. What should she do?ccampbell