I don't have any experience with large, gravid females, so I don't know what is "normal". If you think she may have a RI, I would suggest having a vet check her out, and while you're there see if they can do an ultrasound to maybe see if she is gravid. You can also try posting this over on redtailboa.net. There are alot of breeders there who have way more experience than I do...