Well, shoot - Dean's list was a good start!! My mom used to tell me that all she wanted from me was for me to be successful. On a more practical note, I don't know of many mom's that couldn't use a bit of pampering. Jewelry is good, but I'm guessing that's probably not in the average student's budget! If there's a spa near her, you could always get her a gift certificate for a facial, massage, or other such treatment. The other thing you could do is a coupon that entitled her to a dinner out with you at the restaurant of her choice (your treat). Otherwise, look around at what she might need. Are her gloves getting ratty? Could she use a new scarf?
Good luck! and Merry Christmas.
JC