I lived on campus for 5 years, in Crocker, and got my BS in CHEN. You can study in the dorms. It takes patiences and preserverance. I went to the library once in my undergrad college career.
On the other hand, it depends on how you want to do finances. Right now, I am assuming you are covering everything and it is fine. Questions for you:
-Does she pay bills on time?
-Does she ask for money all the time or does she make do with what she has or what you give her?
-Does she have a job?
-Does she like to sleep in late/keep weird hours?
-Does she REALLY not know anyone living on campus next year?
The nice thing with dorms is you don't have monthly bills. That means someone is going to have to start paying them/get them in their names. You will have to sign a co-signer agreement with any lease, unless your daughter has a rental history already.
What/Where does she want to live? If she is going into a cheaper house, then it might be beneficial in terms of costs (barring her living in a modular dorm now). If she is moving to the "Luxury Student Apartments", then I would say the costs will start adding up quickly (cable, internet, electricity, water, trash, sewer, etc).
Does she have the ability to pay bills already/will you be funding her? Or will she blow the rent money on pointless things, forgetting she has to cover it and then come back and ask for more?
Does she have a job/hours? Does she work? Does she work on campus? Moving off might make working a bit more onery. If she keeps weird hours (studying, groups, etc) parking can be a bit more...interesting too. She will lose more sleep, due to the fact she has to ride the bus or drive to school. All the driving does add up to extra gas.
Is she wanting to move off for a BF or sig other? Does he/she want to stay over all the time and the roomie has an issue with it? Or does she want to stay over there and can't? Honest questions.
Is she prone to cooking/cleaning up after herself? If not, she will probably start eating out more, which is more expensive. If they are like most sophomores, they will try to cook for a few weeks, give up when classes get hard, and eat out all the time.
Does she want a place so she can "party"? Another honest question and rebuttal to why she wants to move out.
Sorry if this is a bit long winded, but there are a plethora of reasons why you would want to move out, mostly vieled under the "I don't know anyone!" reason. I had all ages of roomies and never once did it bother me. I think I was a roommate with one of the other posters.
The big thing, I think, comes down to money. How do you want to deal with paying for things for your daughter, if you still are (which I am assuming; if she was self-sufficient, I would assume you would let her do her own thing). Not too many sophomores that I know are good with paying bills and keeping things going on time (or they have a roomie that DOES NOT know how to pay on time/constantly late).
hth
~egon