Help with color/markings

She breeds mice for feeders

Yep, I breed/buy mice as feeders. I would just recommend buying the non-marked, non-highwhite rats to use for breeding feeders. You will likely get larger, healthier litters, since the hoodies/selfs/berks/etc aren't as inbred and will have healthier genes. Try the PEW/Albinos, they have HUGE litters and are great mothers.

Can you explain the difference between high-white and PEW/Albinos?

http://www.afrma.org/fancyrm.htm

That should help! :)

The AFRMA officially considers the genetic albino to be a Pink eyed white. There is a genetic difference between an albino, and an animal that has been either 1. Bred selectively for more and more white over many generations until the end result is a PEW animal, or 2. Is an animal with many genetic dilutions creating an off white/white animal.

A genetic albino is a simple recessive gene. Number 1 is a result of modifiers and sometimes the white spotting gene, number 2 is a result of many dilutions. (e.g. PED, RED and mink)

The Ratbehavior.org link in my signature has a great section on the different coat modifiers. Only a few, but it is a very interesting read and I highly recommend it. :)