Hmmm......
She's just over a year old, but how long have you had her? Has she defecated for you yet? Good idea to take her to the vet just to be sure - when's the appointment?
After looking at the pics again, she looks more bloated than fat. I'm glad you switched off the rat pinks for now. Mouse fuzzies are too small for a 1 yr old boa, but so are the rat pinks and I'd want to know what's going on with her first before upping her prey size to something more appropriate. Keep us posted on what you find out at the vet's!