Been a while since I first posted, but took her to vets and glad I did! I had never noticed it but vet immediately saw she had a bit of an abscess on her cloacal gland (well in cloaca area) so he drained it out and looks like the non-feeding could also have been precipitated by her having a cut inside her mouth. It was healing when vet saw it - don't know what she could have caught it on (maybe a sharp bit of aspen or maybe a claw or something from rodent) but apparently hoggies have very sensitive mouths compared to other snakes.
She is now on antibiotics and anti-inflammatories - if the antibiotics don't work (he sent sample off to lab so we've got the right one) he said he'll have to put her out and do flushing - poor little thing
Funnily enough after her first vet visit she took a fluff when she got back but hasn't eaten since