Yeah Bells are not rare. If anything I think rainwaters are the least common, also not considered rare by any means.
Bells have become much more common in the last few years with the release of the Enigma by Mark Bell and everyone trying to create the Bell version of a RAPTOR aka a RADAR.
She's still pretty skittish and when approached will make the odd little noise, working on it! She seems pretty healthy though and ate on the second day I had her.