To get my ball roxy to eat a frozen mouse i first had to skip 2 feedings (2 weeks) so she was more hungry than usual and more willing to eat anything (by ANYTHING i mean dead prey) and wa la, it worked and she took it down no prob and has been eating frozen (rats) ever since

also you can just stun the mouse (basicly injure it enough so its just barely moving)................personally i would feel bad doing that,but hey the mouse is going to die anyways.

Or maybe you didnt get it warm enough (i had problems with that at first) so maybe just try a pre killed mouse.