I wish het pied markers were a sure-fire way of telling I mean what does it hurt to try and prove out your girl? Pick up a het-pied boy... you can get them for hardly anything. It's the girls that are most expensive.. and see what you get!
Too bad it isn't instant gratification, otherwise I'd try. lol. There is a really beautiful 'normal' girl at the petstore I work at. She looks very similar to the "pastels" we've had come in.. that started out looking normal, then faded into an orangey lighter yellow after a couple months. She has bright orange-ish patches all allong her sides.
Our local pet store has some really nice looking normals. One is very dark and another really light. They were coiled up together the last time I was in and it stopped me in my tracks. If they weren't $70 each I would probably pick them out and see what happens.