Solid race pedigree there. I remember Loom and Dancing Dervish being crossed on QH's quite a bit and making some fast horses. The rest of the pedigree is well known quarter running horses.
The dam must have been a cropout. Too bad nobody went back and picked up her AQHA papers when they opened it up to cropouts to be registered or your mare would be AQHA as well as APHA.