There used to be information on finnmouse, but I don't know if its still there (or where its located). There are two similar colors, Mock Chocolate and Light Mock Chocolate (which is lighter). Mock Chocolate is a/a cch/ce and L. Mock Chocolate is a/a cch/c. So it will make a drastic difference in what you get in your litters as a result.
There are a few ways to make mock chocolate on the C-locus. I have an Abyssinian who is a/a c/cch (they call that stone on Finnmouse), he's quite a bright milk chocolate. Other pseudo-chocolates include very dark a/a ce/ce (stone in UK, beige in USA), bright a/a cch/cch (chinchillated black, sometimes known as sepia), and a/a ch/cch (Burmese in Europe, sable Siamese in USA) with no discernible points. There may be more, but those are the only ones I can think of right now
I was told on another forum, that if she is burmese then I would get mock chocolates from her.
If she was mock, then I dont think I would of got more mocks from her by breeding her to a PEW, but not real sure.
Depends entirely on what kind of mock chocolate she is!
Breeding her to (albino) PEW would be the best way to tell:
a/a c/cch x a/a c/c = PEW and mock chocolate
a/a ce/cch x a/a c/c = Black eyed bone/cream and mock chocolate
a/a ch/cch x a/a c/c = Himalayan and mock chocolate
a/a cch/chh x a/a c/c = Mock chocolate
a/a ce/ce x a/a c/c = Black eyed cream/bone
And if she produces blacks, then the chocolate colour is nothing to do with the c-locus.
If the whites turn out to be himis then she's a burmese with no points, and if they are whites then she's a/a c/cch (which I call light sepia since dark sepia is a/a cch/cch and it doesn't have a proper name).