Stupid question, but: Is the snake big enough to be eating adult mice? Could be that the mouse is too big, especially if it's a younger snake.
What are your temperatures? Have you tried feeding in the enclosure? When my snakes won't eat I try feeding them where they are most comfortable, and that usually does the trick. Try leaving the mouse in front of the hide, but if an adult mouse is the correct size of food, stun it first (bang its head on something) so that a) it doesn't hurt your snake and b) it still moves but not too much so that it doesn't scare the snake.
Good luck!
~jenny
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1.2 normal ball pythons (Cindy, Darwin, and Periscope)
0.0.1 california kingsnake (Tetris)
0.2 rescue chinese water dragons
1.0 rex rat (Scurvy)
1.0 gerbil (Yerbul)
0.1 bunny (Spazz)
1.1 betta fishes (Vicious and Killer)
2.2 great danes (Shasta, Odysseus, Merlot, and Watson)
1.0 fat fuzzy mutt (Smokey)
1.1 cats (Thidwick and Turtle)
2.0 horses (Buddy and Sam)
1.0 goat (Billy Jack)
1.25 chickens (Ugly the rooster and his harem)
"God is a comedian playing to an audience too afraid to laugh." - Voltaire