hi
Well for one did you purchase this hatchling as eating?
Here are some suggestions:
1. Leave her alone for a couple days, no holding her. Then place her in a small dark box or bag, no escapeable with thawed pinkie. Leave her overnight.
If this doesn't work
2. Try placing her in bag/box overnight with a thawed pinkie which has been brained. This means expose some brain, or blood by making a small cut. The smell of the blood and other fluids can drive the nuts for eating!
And you really shouldn't leave prey items in a cage for 3 days! Overnight would be the maximum as they go very bad very very fast and your corn wouldn't touch this decaying animal.
good luck!
bmm