I am dealing with the same type of situation with one of my baby females, she's only about 75-80 grams and refused for 6 weeks in a row. I moved her to a tiny tub, maybe 6-10 qts, I drape a towel over the top and back of it, I left her alone for 5 days, then put a small hopper mouse in with her. She snatched it in about 5 seconds. She had refused a rat fuzzie the week before.