I would think another option to remember is that an hour or whatever can be achieved over a day. So, if her endurance is so low that she can't tough out anything for that long, splitting up the workout wouldn't be bad. Chair squats and shoulder presses or something with 5-10 minutes walking, then later pulldowns and something else followed by more walking, etc.
Then, she gets value, can work on improving endurance, and still gets in more than 10 minutes of activity a day.
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