Ok, what exactly are you trying to do with her? Are you planning on breeding her? Or, are you just trying to keep her up to a weight class that u think is right for her age?
I have two normal's right now. I have a cheap food scale that I guess I could try and use to weigh them both? One of my normal's was pretty thick at the start (2" circumference). But, she refused to eat f/t fuzzy mice and didn't eat for a few week's. I then had to buy live mice. In the last week or so I tried a method that I read on here? I left a thawed ween rat in her tub overnight(with her size I just went to ween rat's). And, YES! success she ate it. I just gave her another one on monday and checked tuesday and she ate it.
My other normal was way smaller and skinnier at the start. But, alway's feed on f/t fuzzies for me no problem's. And, after a few week's I offered a left over ween f/t rat (was suppose to go to the bigger normal. she refused at the time). I was supprised to see that he/she took it and finished no problem (consticted and swallowed right in front of me).
Basically, what I'm trying to say is? I feed my normal's every 5 day's on f/t ween rat's. I usually thaw out a bit the rat's then soak them in hot water. When there wet the fur flatten's and the ween rat is very skinny and flacid. So, if your bp is 1.5"-2" all around at it's thickest point? Then you should be ok to feed her a ween rat.
And, yes she will increase her growth speed immensely. Since, my smaller normal feed's everytime? He/she is passing the larger normal in circumference and almost length.
I do remember after she took the very first ween rat , she didn't feed the next week which was weird? But, she came back to feeding everytime I offered since then.