I agree with what's been said, with one potential caveat.
IF she's eating like clockwork, then don't read on. Stick with mediums and all is well with the world and your girl.
However, is she skips meals, as my Shayna did, you might want to try smaller meals a little more often. Shayna is now about 1.9kg, but at about 1.7-1.8kg, when she was an adult, she often skipped meals and fasted all winter.
I went to small rats every two weeks and she eats regularly and no longer refuses unless in shed. She actually gained weight on the small rats. To each his/her own, but for those with BP's who skip a lot, smaller meals more frequently can work better.
She does fast most winters, but not for as long.