Just don't bother offering until you move back, then, if you don't think she'll take them. There's not point in wasting them, unless you're far enough from home that they would thaw out on the way and be wasted anyways. At 900 grams and not eating already for 3 months, two more weeks won't hurt her. Give her a week to settle in once you're back home, then maybe try a live rat smaller than she would normally take.