My 83 Year Old Mother-in-law's Blood Pressure Dropped 94/47last Night.

My 83 year old mother-in-law's blood pressure dropped 94/47last night. She was eating supper and couldn't remember how to feed herself. We have to help her sit in her chair and go to the bathroom. For several weeks she has not been able to line up with her chair or toilet. She said she feels very tired. She was diagnosed with 2 blood clots in her legs back in July and one in her lung. She is on xrelto.