Echoing some of the other comments, I would encourage including an evaluation for ADHD, which has now been categorized into 7 different subtypes (see books by neuropsychiatrist Dr. Daniel Amen, who has done extensive analysis of brain scans). ADHD can be strongly linked to other issues like depression, anxiety, and hypersensitivity.
Speaking personally, I went undiagnosed until my mid-thirties, and reflecting back on my experiences I can see that my ADHD showed up big time in college. I had had straight A's up until then, and had enough structure in high school to cope with the challenges. Going away to college I really struggled, and I thought emotional issues were the cause. (In reality my struggles were primarily connected to "executive functioning", a term that has already been referenced by a previous poster.) I ended up seeing 8 therapists over the next 15 years before someone finally thought to test me for ADHD. I can't describe the deep relief of finally knowing that there wasn't anything "wrong" with me, I was simply wired differently.
Whatever comes next, your daughter is fortunate to have your support and your determination to get to the root of her experiences and find answers!! And the good news is that there are so many more resources available today, and less stigma attached to counseling, therapy, and medications. It's important for her (and you!) to understand that's she's not alone.