Thanks Jen. And yes, this place's small rats are really small. They're bigger than crawlers, but not by much. I don't think she's older than 4 months because the breeder told me the exact day she hatched and which clutch she was from. He said she was memorable because her entire clutch was super aggressive, but finally chilled out. He did say they were all pretty voracious feeders and I've found that to be true.
Unfortunately, this rat was so injured that he didn't survive, so I don't know if my male would have taken him or not. I did check the female again today when I had her out and she's finally shed, but she has a couple of marks on her side that look like she may have gotten scratched. They're very faint and I only noticed them because she had a tiny bit of stuck shed just on that one spot. So maybe he scared her. I don't know. As long as she eats next time, I'm not going to worry too much about it. I was mainly wondering if anyone had experienced a snake rejecting a rat who turned out to be ill. I do appreciate all of the helpful replies, though!