UPDATE!

Yesterday I picked up 4 small hoppers. As soon as I got home I decided to offer Belle one. I offered it from tongs. I figured live from tongs is a good first step towards thawed. At first she showed no interest. However, she also didn't seem frightened by it. So I dangled the mouse in front of her for a while. After about a minute(felt like an hour) she started to show interest. She very slowly started to move into a striking position. She looked like she was about to take it when the mouse touched her nose. She backed off for a few seconds. But then started to get back in position. She went for it once and missed. Reset again, and she went for it, and got it! First feeding was a success! I was so excited!! Also, I have 3 adorable little hopper mice as pets till they get fed off. lol