Stokes can be caused by a few things, blood clot, artery blockage, an injury, the older you get the more possible it is to have a stroke, because hardening of the arteries, and lifestyle catches up with us. Some mild strokes are recoverable. Though there may be some weakening in certain areas permanently. Doe she have marked weakness on one side? Usually that is symptomatic of a stroke. Possibly a droopy eye, mouth, poor coordination of limbs on one side. Comatose? That would be a little unusual... I mean if it is a big stroke, but is she on any medication? Perhaps that's an issue?

Good luck...