The transition from high school to college is extremely difficult and challenging. My DD is a math major with a physics minor. She started college with 18 credits from taking hs AP courses and while hs teachers like to tell you that AP courses are comparable to college courses my DD says they are not. DD started as a secondary ed/math major and quickly realized by the end of her first semester that teaching is not for her.
Once high school is over, many kids are expected to move away from home and start the journey to make new friends again, while doing laundry, taking care if a dorm room or apartment, going to classes, and trying to avoid the college pressures of drinking ( which despite what colleges tell you us extremely prevalent).
My DD lived with a Community Assistant (a CA is responsible for a wing if the dorm including counselling kids within his/ her capacity) for a dorm for 2 years. In that time my DD saw how difficult it was for many kids to make the transition. They are feeling stresses they have never experienced before, like homesickness, difficult classes, etc. There are kids in campus who have therapy pets who help them deal with stress (one girl even had a therapy iguana). CA even help kids who are having a hard time meet other people who basically take them under their wing, go to meals with them, check on how they are doing in classes and help them get the help they need.
As a mother, I fully understand and can empathize with what you are going through. Your DD is so lucky to have you and that she feels comfortable to confide in you. With your suport she will get through this hurdle. But in a way it is good for her to go through things like this so she learns how to deal with life's stresses. My DD is graduating this Dec after 3 1/2 years. Her stresses now arefinding a job and the possibility if moving away into her own place. She is freaking out, but all I am doing is steering her in the direction she needs to take. She has gone to career seminars and workshops and is feeling more confident.
Again, thinking of you and your DD and know that everything will be just fine.