She has started fading out today so yes she is now going into shed.
Thanks for your replies everyone, I went to this vet on a recommendation of another Rep friend, luckily having snakes only a year I've never had to use one before.
It's a tough one because I dont want to stress her out taking her to another vet, which wont be very local yet I dont want her to suffer, but Del I'm sure you've seen enough of this or you wouldn't give me that advice for nothing, also I dont think it's an abscess as it goes up and down and an abscess wouldn't do that.
I think I'll try for a second opinion (home visit) in a couple of days. I'll let you know how she does.