I've seen this come up on several threads lately - has there been some new development in horse DNA testing I am not aware of? Last I understood it, there is no DNA test out there that can DETERMINE breeds or mixes thereof in horses. The only DNA testing currently done on horses is to prove parentage - by matching the DNA profiles of get to the DNA profiles of sires/dams.
Gidget, to me your horse looks like a QH type paint. Not all of them have smaller babydoll heads, just like not all walkers have big jugheads and not all arabs have tiny little dish-faces. I don't see any reason to assume she is mixed with anything - particularly not that little bit of fuzzies on her feet.