I don't own a JRT or IG... however in the pics for sure I see a lot of JRT, but I could also see the IG part in her. I don't think 12.5 lbs is all that much for a JRT or a IG.

The vet clinic I used to work at most recently we had several IG's that came in to board on a regular basis. We had this one IG, Cody, who was there all the time.... but he was 20-21lbs!! He was actually FAT!! The ONLY fat Greyhound (Italian) I have EVER seen.... lol