Daughter won’t talk about being autistic

Hi my daughter is 17 diagnosed age 4, but has never wanted us to tell anyone about her autism and won’t acknowledge that she is autistic. Wee trying to help her understand why certain situations (friendships, exam failures etc) could be as a result of being autistic to help her cope, but she just shuts down.  

she’s possibly going to college after school and we worry about her being in a new environment from the one she’s been used to for the last 5yrs and how she’ll cope with this, should we seek expert help or does anyone have any experience in how best to try and get her to talk about it? Thank you