thrush is yeast/fungus and yeast can take up residence in any warm damp moist place. your grand-daughter's case the ear canal was it. so yes it is possible and happens quite often. since yeast is airborne i have no idea how she got it. remember that yeast/fungus can also cause diaper rashes athlete's foot and ringworm. not just vaginal infections.
is it possible to get thrush in ear. my granddaughter has been told she may have thrush in her ear and the ent is going to use the purple liquid on her next visit. is this even possible and how would she have gotten it?