So, I took all the precautions. Removed the rat from the freezer around 4 pm. Let it defrost until about 9pm. Once it was thawed, I placed it in hot hot hot water. Took it out of the bag and heat it with the hair dryer. Lowered it into the tank, and after one failed strike, she ate. This is the first time she's eaten in three weeks. Next scheduled feed is in two weeks, when I will try the same procedure and see if she skips a meal. So happy that she's eating again!