Dwarf Albino

I have some normal females that are 2006 also and in the 500-600gram range....

Could it possibly be internal parasites? I know that when mammals have parasites in their digestive tract, the parasites use up a lot of the nutrients that come in and the host ends up becoming malnourished and loses weight or gains slowly. Not saying she has them, but it wouldn't hurt to check.

I'd be very very careful attempting to breed her. Even if you found a "dwarf" male, the genetics of "dwarf" balls are not yet well understood, and she could easily produce full-size eggs that either have to be surgically removed or end up killing her.