Just wanted to know what you guys think I should do to switch my ball python from mice to small frozen thawed rats...

She has been so picky about her food, she only eats thawed mice, when a thawed rat goes near her she totally gets snooty and turns away immediately and heads the other direction, like she hates the smell!

She has always eaten very well, only refused food once the whole time I have had her, except when she refuses the rats, but as soon as a mouse is offered afterwards she will take it immediately. She is at the size now, I need to feed her 3 extra large mice to satisfy her, (I always get these frozen mice that are pregnant, they are pretty large for mice)

What should I do to convince her rats are better?

PS I have even tried scenting the rats with mouse fur and bedding etc...