Nik, my DS8 (who has ASD) was like this-- even kindergarten homework that didn't challenge him sent him spiraling.
For someone your DD's age, I'd see if she's open to visiting a cognitive-behavioral therapist. She needs to change the way she thinks about this task-- it's not a simple job, but it can be done.
Definitely approach the college-- they should have an office of disabilities-- find out what documentation they need in order to offer accommodations. You can also see if they have a psychologist on campus who works with students with this kind of issue. This isn't going to be solvable in a few weeks, so she'll need support there if she is going to continue to make progress.
Ultimately, you don't want it to end with accommodations-- you want your DD to learn the skill of writing, which is one of the key things people get out of college.
HTH,
DeeDee
