Tiring her out in 5 minutes may be unavoidable if that's what her condition will permit. I'm going by my own experience here - that minute 45 secs was the longest of my life, and I was gasping for air after it. Walking a flight of stairs might do the same for her - what seems like a given to people of more typical bodyweight is a challenge for those of us with higher bodyweights, esp without a history of exercise. In a sense this is putting the cart before the horse, as once you've seen and assessed her abilities I'm sure you'll be able to come up with a much better program adapted to her capabilities and limitations.
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