Thanks for all your input guys. Next week I'll think I'll try the tip about feeding a mouse first and then a rat right after. (Considering the rat is a little below 15% her body weight. I'll also thaw them in the same bag so the rat will get scented as well. We'll see.

I'm still curious what would be a healthy fast for a snake her size. (640g now). Just so I know when to stop trying. It's already about about a month, is it safe to go for two?