What should I feed my pregnant dwarf hamster?

Scrambled egg is ideal, a teaspoon full is more than enough. Also you can soak some chunks of wholemeal bread in full fat cows milk, both provide extra fat and protein, which she'll need because the babies will take a lot out of her. As far as the babies go you'll likely get a mix of the two different colours. It's unlikely that they'd mix and you'll end up with a grey hamster or something. Ideally don't mate them again though, red eyed hamsters that aren't albino often carry genetic defects. They show up more often in their young if both parents have red eyes, but there's a risk involved if the other parent is normal too.