Maybe I made a mistake then on size. She's a little over 6 and a half feet. When I measured the thickest part of her body it was about 4 inches wide so I assumed she would require a very large rat and then probably eat every 3 weeks. But it seems like I over calculated. I assumed way too large.

In regards to the medium rats, do you feed her only 1 or 2 then? Maybe I'll start with that and then go up to a large rat in the future.

Thanks again everyone for the help, very much appreciated!