I'm from the UK too - I've seen some pretty grim reptile stores but this one is terrible to sell a 2 week old w/c baby - there is just no need for it.
I can't really offer much advice I'm afraid, only to say I've seen a product around called "Lizard Maker" in our local store - maybe there are "mouse makers" or "rat makers" too - it is scented with these things and I guess it's to make them more acceptable to fussy eaters.
I know the store said to try fuzzies, but have you tried pinkies? Just a thought as I fed one to my hognose the other day who would normally have a mouse but had regurgitation a couple weeks before so I tried her on something small to start off again.
I really wish I could be more help but I can't think of anything. I really hope she eats for you soon.
~Sue