Firstly, depending on where you live sometimes there are laws about keeping strays, especially if they already belong to someone and have just escaped etc. Before making a definite decision I would suggest talking to the local humane society or rescue groups to check that it's ok to keep her. A lot of places require that the cat be held by the humane society to see if someone claims the animal before it can go to a new home.

From your profile it seems you are in Michigan - I would probably check out this page here about tips for what to do.

From there, actually keeping her really depends on your plans. Animals, as you are aware, are a big commitment for food, vet costs and ongoing care. If you are looking at changing to a different college would you be living on campus? Would they allow pets? Would someone be able to look after her for you if you decided to keep her?