Is this a Hog Island Boa??

[CloudtheBoa]

She is not thin, I'd put her back on a single prey item. She does not look 6', but if she is bump her up to a large rat and space it out every 4-6 weeks. If not, keeping her on a medium every 3-4 weeks is fine. Boas are not meant to be round, the shape you're seeing on her is a perfectly healthy, fit boa.

As far as Hog Island sizes, they are not a dwarf locality so they will get the same size as the average Colombian (5'-7' with the potential for 8'). I've heard some of the original wild caught imports were 8', and I know at least one breeder whose breeder females *average* 7'+ (yes they're all pure), so they don't have to be crossed to be large. That said, your's does not appear pure, just going off of visuals.