Honestly, I never like to leave mine completely alone for more than a few days. Especially if she hasn't eaten, I would go up and check on her if you can and try to feed, but you don't want to feed and run either, I like to be able to check on mine for 24 hours after eating.
I came back to my mom's house for my winter break too, but I said I could only come home if I could bring the snake. It worked. I know some parents are not so obliging, but it's worth a shot. I would say if you aren't going to have her with you, you should check on her AT LEAST once a week and invest in a larger water dish (if you haven't already) to hold her over.