Amber and I were going up there ever few weeks just to spend time with her and get Dad a little relief . Its really hard . Watching her learn to walk again , watching a machine breathe for her , but I ' m glad I was there .
According to the above context, choose the best option to answer the following question.
Question: Why my their mother had to learn to walk again ?
Options:
- She may have forgotten how to walk due to Alzheimer 's .
 - None of the above choices .
 - She preferred not to walk and drove instead .
 - She may have to learn to walk after a stroke .


She may have to learn to walk after a stroke .