Thanks you guys, she's still not passed yet and they aren't always noticable but seem to have moved from a few days ago althought it might just be wishful thinking on my part! Going to soak her again today and I cleaned her tank out yesterday which usually helps her go to the toilet, she doesn't seem in pain or anything though.

Wow, it sounds dumb but I'd not really considered snakes getting cancer, if she doesn't lose it in a couple of days I'll get her to the vet at the start of next week. Thanks again!