make sure the mouse is near a wall because the snake is more likely to follow walls than go to the center of a room. you could also put snake traps from LLL reptile in each room, the snake will use it as a dark hiding spot and hide in it and will be trapped and safe until you find it
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jake

my addiction:
0.2 normal ball pythons (lazlo and izzy)
0.1 amelenistic corn snake (maizy)
0.1 blizzard corn (blizz)
1.0 albino cal king (zeus)
0.0.1 wc garter (zim)
hybrid breeders association
hybrid haven