Problem resolved! I left the rat in the enclosure, head towards the opening of the hide box, and in the morning it was gone! Now, Bredli Girl is basking happily under her artificial sun. I actually took a picture of her yesterday's fight with the dead rat. Here follows my first attempt to upload a picture on this forum:
Glad she finally took it for you.
I had a problem similar to this with one of my Murray Darlings.
Went 3 feeds downing a Large Adult Rat no probelm (every 10 days).
But the next 3 she just couldn't manage it.
Even left the food in there overnight in front of her hide with no luck.
I ended up having to give her a Small Adult Rat every 5 days instead.
Which works out to be roughly the same size as one Large Adult Rat.