I have a friend who has an electric wheelchair and it has leg supports that can be raised or lowered to support the legs. You might talk with your Mom's insurance company about upgrading her chair.
This is repairable for considerably less than the cost of a new chair. A Mobility Specialist can order replacement parts. Depending on your location, There are some areas that have this on call service, that comes to your problem.
There are also retail repair locations where you take your equipment to a Mobility Technician. The cost is comparable in most cases because the overhead of a retail location with a shop is usually higher than a Mobility Troubleshooter. The on call service saves you the cost and hassle of lugging heavy equipment to a shop.
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