Hey, everyone. Recently I moved my WC Eastern black-neck, Mort, into a 15 gallon long terrarium. She had previously been in an enormous 55-75 gallon tank, and I decided that it would be best to downsize. At the moment she has an undertank heater for warmth, a warm hide, two large fake ferns draped across the enclosure, and a large plastic water dish doubling as a cool hide. (She burrows underneath) As substrate I have about four inches of aspen bedding. Mort normally eats small thawed mice once a week, but shortly after I moved her, she stopped eating. She's had eating issues before, and I've had to start feeding minnows (Extremely bad for her, I know.) twice now. Both times I converted her back to mice eventually. The last time she ate was September 18th, so it's been nearly a month. She's been somewhat active, but just hasn't fed. I'd just like to know if I need to give her a slightly larger enclosure (I'm thinking a 20 gallon Critter Cage), if I need to feed minnows for the time being, or what. She's an extremely shy snake and won't eat when I'm in the room, so when she doesn't eat it's hard to say why.

EDIT: Also, she stays in burrows almost 24/7. Should I have less aspen in there, or switch to a different substrate? Just wondering.

Thanks for reading,
Daniel