Yes, the appaloosa traits will start appearing. Mottling and even striped hooves can appear as they mature, so I'm sure she inherited some genes with both those parents. I can't wait to see how she changes!!
Sometimes the dun stripe that many are born with, is just countershading, and disappears as they mature. Many a horse has been registered as a dun, that really wasn't. But it will be interesting to see if daddy really was a dun and she is showing some of the traits. With duns, time surely tells.
Can't wait for a new picture or two!!