My Daughter Is 31 Years Old And Has Been Living

My daughter is 31 years old and has been living with us for year. She got a job and hurt her back and it has thrown her into a deep depression. She is not able to do her job anymore (do groomer) She just sits around and cries, and I so down. I am so worried. I am a very upbeat person and I have tried to make her life as pleasant as possible. She has a therapist ad a psychiatrist and is on lithium and claudipin(sp?) What can I do to help