I would never ever recommend freezing something that you've thawed out. I'm not sure of the ill consequences but I remember a thread like this before and everybody agreed that it's best to either feed it to another snake if you have one, if not then throw it away.
EDIT:
What I have done in the past is I put it in the enclosure under the heat lamp for my RBS and within an hour it's gone. Sometimes they can be picky and like to eat in their enclosure, this is the main case with my little one, the two others usually will eat if I put them in a sterilite tub.