12yr old daughter

Hi my daughter  is still struggling  with anxiety and depression cyps are coming out twice a week to help her she is taking fluoxetine medicine they say she may have autism how long does it take for them to know this has beenot a year that my daughter  has been going through this things only got moving in October 2017 has any one got any advice she is still limiting her food in take they say that's fine am I just being over anxious thank you for lintending.