Granite? Yes, definitely.

Is it genetic? That you'll have to find out by breeding her.
Granite isn't always genetic.

How to tell:
There's lots of speckling in her windows, instead of just large spots. She even has the neck spot, though it's a small one, and that's a marker for genetic granite--so it's worth proving her out to see. At least, if you have an interest in granites. She has some nice flames, too.

Granite isn't really all that subtle, it's pretty easy to distinguish.