Agreed with Caitlin. My guess is she realized something was up with the rat, most likely that it was still partially frozen, so she "spat" it back out. In my experience snakes will reject food mid swallow if they're disturbed or if something's wrong with the feeder, which again would be my guess here.
As Caitlin said, I would take a serious look at your thawing process, wait a week with no handling and no disturbing the enclosure, and try again with a properly thawed rat.
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