Worried about my adult daughter

my daughter is in her early  30's and  I am sure that she has ASD. As a child she seemed so normal and sociable but gradually as an adult she developed more and more traits of the autism that her brother has been diagnosed with. Recently she  seems to have lost all the joy in her life -she goes to work during the week ms the rest of the time  she lives in her room and does not interact with anyone. Over the years I have tried to help her and have persuades her to go to the GP but all they do is prescribe anti depressions and tell her to contact I talk. I fwel she needs more specialised help but don't know where to go or how to persuade her to seek that help. I feel at the end of my tether as she shows no signs of ever moving out or being independent and she seems to have become increasingly hostile towards me despite my efforts to help her.