BPs are tough animals as long as the conditions are right. She should rebound easily.
If you post a picture, we could better judge her condition as to being underweight or not.
Congrats on getting her on the FT rats. Don't try to overfeed her right away though. Slow and steady will be healthier.
10 years is not "old" per se. I know breeders who had females still breeding strong at over 25 years old.
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