I have helped quite a few parents find a home or condo for their daughter or son. Of course you want your daughter to be safe and comfortable. We Realtors are a very regulated lot, and with good reason. For us to characterize neighborhoods is not legal. There is a source for you to make your own determinations. The Ann Arbor Observer is a wonderful resource for neighborhood information, including crime statistics. I would be happy to send one to you, with a relocation packet, if you wish. It may also be available online.
I would suggest that you go with a local Realtor, who knows the campus and the area. It is a large campus, and proximity varies according to the school she will be attending. Affordability is going to be relative to your context. Because rentals are high in Ann Arbor, a good case can frequently be made for an investment in housing. But depending on how long she is going to be here, you have to factor the costs of buying and selling in your decision. If she is only going to be here two years, it may not make sense from a financial point of view.
If I can be of further help, please don't hesitate to email or call.
Which grad school is she in and I can better advise you which part of the campus area she should be on, if she wants to ride a bike or walk.
My search site is http://SearchAnnArborHouses.com you can start there to get familiar with the area.
The homes surrounding U of M are more expensive, older with less square feet. However the condo's are more affordable.
There are several options I would be happy to discuss with you. For example which campus will your daughter be attending mostly? What are her means of transportation(drive, bike, bus)? Also, what price range would you like to stay in? Once I know more details, I can set you up with email notifications of properties that best meet your criteria and suit your daughter's needs. If you would like to get in touch, my contact info is below.
You may also find my website helpfull http://www.mtoomey.remerica.com. From the home page, click on the Ann Arbor link on the left.
Mike Toomey, Realtor
Remerica Hometown One