WOW! She's a tiny thing.
okay, have your tried:
A really small rat (not sure what the comparable rat size is or if there is one?
When you warm up the rodent, do you do it in room temp to lukewarm water for a couple of hours, make sure it's thawed, and then quickly drop in hot water (like 120 tap water hot, not boiling!) to warm up, dry off, and offer?
My snakes love to see the warmth and do not like cooked rodent. Not sure if you are new to this, and ignore if you are, but you want raw rodent warmed up. Not cooked rodent warmed up. If that makes sense.
Also, have you left the rat (again only F/T) in the tank with her for a few hours and walked away. She might be a little shy as well.
And I would wait at least 5 days before offering again.
Just some initial thoughts.