Craig
we've had a few interesting posts over the last few months that suggested the photo period (length of daylight or simulated daylight) is important with regard to snakes feeding. If this is too short the snake thinks it's winter and may be put of eating.
There are quite a few other things you can try but to be honest I'd say be patient and offer her whatever the breeder gave her lat once a week for a few more weeks and see what interest is shown.
I posted a message some time back that had a whole bunch of the things that I had tried with my reluctant feeders. I'll see if I can find it.
Graham