Downhill + uphill doesn't = straight. An uphill horse is desired because it will naturally work off it's hind, something desired in most disciplines. While it really has no effect on a regular old trail horse, from a breeder's standpoint it is generally avoided. When crossing the two, one would hope for inheritance of the uphill-ness (However you term it) from the sire.
What she does really depends on what she plans to use the foal for. Though the foal would have full ApHC papers (Assuming sire is a registered Appy? I think I'm wrong...) I'm guessing by his pattern and foals that he is heterozygous for the loud coloration. So you'd have about a 50/50 chance for a patterned App - correct me if I'm wrong... The leopard complex is called a complex for a reason.
"It's amazing what can get done when no one cares who gets the credit."