don't try and diagnose your mother. there can be hundreds of reasons. unfortunately some of those reasons can be serious so to be on the safe side it is very important for her to be carefully evaluated as soon as possible. seeing a neurologist would be ideal but you may need to see her primary care provider first. there is absolutely no way to predict if she will have future memory issues especially since the underlying cause/reason for this initial episode has not been determined. don't let her talk you out of seeing a medical professional. insist that she goes.
my mother 45yrs suffered a sudden memoryloss ystrday and regained after about 50mns. why might be the reason for this? . she is very stressed lately. i s ther any chance for any more memoryloss episodes?