If you've seen this pinkie on radiographs, you should know exactly how big it is, and so you should know if it was a mouse or a rat. There is a pretty big size difference between a pinkie mouse and a pinkie rat.

Maybe, if it is a pinkie mouse, the reason it was able to get into the intestine without being digested is just because that is a tiny meal for a BP? I'm really just guessing. As Dr. Del has said, the vets that have seen her in person can offer you much better advice than we can offer over the internet.