I know! That's what I thought too. Her skin seems to be wrinkled on but not the way it would be wrinkled in a bad shed. I dunno, it's just... different...
Boas have more difficulty digesting fat. Check out this article from Basically Boas. This seems to be similar to what I'm seeing here. The article talks about genetically "fat rats" which seem to occur in jumbos in particular, but this can happen even without the jumbos if a baby boa is still getting too much fat in its diet from rat pinks. I like to have my boas on mice for their first year - the higher bone and lower fat content is more beneficial to their growth, in my opinion. So I wonder if that's what's going on with this girl....