Lots to digest here!
OP first: Dogs tend not to get strokes as they tend not to get clots in the arteries of the brain or heart. That said, the dog brain is not that different in essentials so it's possible. As most dogs don't get a post-mortem, we don't know for certain. However many older dogs do have "strokes" which are actually vestibular damage. The vestibular area of the brain is responsible for balance, so you see head tilts, wobbling, circling. Some can be so severe it looks like a fit. They get better without treatment, but some dogs have permanent head tilts afterwards.
Epilepsy can also present as a "tuned-out" episode so if it keeps happening, get her checked.
Other posts - yes ear issues can do the same, sting, grass seed or a deeper ear infection as the 8th cranial nerve (OOOTTAFVGVAH for the mediaclly inclined!) has its root in the same vestibular area so similar signs are seen.