If she was Roan/husky the markings would fade. If you don't mind, could I post her pic on a rattie forum I'm on to get some opinions? I'm very interested in her marking as well.
The other girl, with the wedge is a blaze, not possum, possum rats markings start directly behind the ears and all of the face is white. The other is a poor hooded and the tan baby is a rex, possibly Siamese. You will be able to tell after she molts.