I'd give her a whole week off before you attempt to feed again. Don't handle her this week either. If she doesn't eat next week, wait another week and try again. From what I've heard, attempting to re-feed too frequently can just stress your snake out. (Keep an eye on her weight, though) Most everything I've read here suggests patience and persistence! You can also try scenting the rat with used mouse bedding, braining the rat, etc. to get her appetite up.