You said you thawed near the tank and then warmed the head. The entire rat needs to be warm. A rats body temp is around 100. I would suggest placing the rat in a zip bag and submerging in hot water for about 15 minutes and then attempt to feed. The others made some good suggestions but I honestly think you just did not have it warm enough.
I have two snakes that will only take a rat piping hot. I feed them first. If it is two cold, which is still very warm, they will not show interest. As soon as I give them another 5 minutes in hot water they take them without issue.
If she is used to live the heat signature of the f/t needs to be similar. That means the whole rat needs to be warm.
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