Honestly we found out how the services actually worked once my kids were on campus. You want to start with Disability Services, but also realize that they may not actually be the source of help in reality: often it is doctors, therapists working with deans and other staff.
The Disability Services office will provide letters for your daughter to give professors and after that it is up to her to negotiate, usually, often with support of doctor or therapist. The letter may or may not list accommodations desired, and won’t have the diagnosis, though professors can usually access it on file.
Options should include single room (which may or may not be helpful and can be stigmatized at some schools if only students with disabilities get them- being honest here), extensions on papers and projects, note takers, postponements of exams if possible or exams given alone in a room, extra advising, excused absences for appointments, and so on.
I suggest making your own list and including them in a letter for a clinician to sign. In my experience the clinicians appreciate this and that way you can ask for what you think will help.
It is good to find a school that does not require withdrawal and reapplication. Many schools will give a medical leave- make sure that is possible. In fact, medical leaves actually can wipe bad grades off the record if the cause is due to her diagnosis.
Make sure to get tuition refund insurance. Set up therapists.
Smaller schools may not have a Disabilities Office. A dean may handle things. In our experience it is hard to prejudge understanding, kindness and even the structure of help available. One small school with no Disabilities Office was extremely helpful. One large, selective school that we expected to be cut throat was incredibly understanding.
You can do your best to find out in advance of course, but the presentation may not match reality, for good or bad.