Not a bad Idea as a stop gap. You would. Just have to be watching the power reading to make sure you are the power she wants to ride at.
I have the Wahoo Kickr bike and I love it. Ride it everyday. I bought it when I retired and my wife’s health is not the best so. This make sure that I get to ride. Up at 6:15 am and on the bike for 20 miles a day. Then a few days a month ride outside when it can be arranged for me to do it.