It sounds like they simply aren't that interested. Get a scale and base weight (if you haven't already), and just keep offering weekly and weighing every couple of weeks. I don't even notice my adults not eating until they lose 10+% of their body weight. The only parts of your post that I found worrying were: The previous owner saying his rat colony "crashed" - What does that mean? Were they ill? Since the two BPs were housed together, how can you know they weren't actively breeding? I'd keep an eye on her for signs of gravidity and have an emergency plan for if you wake up to eggs one morning.
Ha - Slim beat me to it!
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