What color is she?

[Sharon Fazi]

I recently purchased an unusual colored adult female gerbil at a pet shop.  She is black from her ears forward and from her hips back.  In between her ears and hips she is dark brown (not agouti), a lighter shade of black with a hint of brown.  She has a brown spot one-half cm diameter between her eyes.  She has about 15 white hairs between her ears.  She has the white on her front paws and on her chin like a black would.  No white on the tip of her tail. She came from a litter of two male agouti, one female agouti, one female black (possibly spotted) and her.  I don't know what the parents were.  She may be pregnant from her brothers.  What color is she?  What would her genecode be?  What color mate should I get for her or her pups so as not to loose this unusual anomaly?