I have a late 07 girl that is only 550g. She was not underfed at all. She was a picky eater for a while though, so that may have something to do with it. I have another 07 girl that is close to 1200g. She has never skipped a meal.

Anyway, I would not breed her at 900g. If you've gotten her this far, you can wait until she is a little larger. My biggest 07 girl is almost 1200g and I'm still going to wait until she hits 1500g.