I'm not suggesting that you should assist her before you try everything else but what I did when I assisted one female was that I killed a fuzzie rat and gently opend her mouth with the rats nose. I put the rat in her mouth and closed her jaws by gently pushing them together. Then I did just a little pull in the rat so it got stuck in her teeth and steped aside. She ate the rat and has been eatning every week since...

Good luck!