In a rental unit. Management expects renters to move cars immediately after 20 to 24 inch snowfall as in past winter. This is so the plow can do a "clean" job of the parking lot. Mom is in her mid 70's, frail (skinny), arthritic. Impossible task for her. What can we do? Fear possible falls, broken bones as well.
I am with lealonnie here, though. Maybe time for Mom to find a different place.
The reality is, if your mother is frail, skinny, arthritic & it's impossible for her to move her car for fear of falling and broken bones, it's time to move her to a senior living complex that meets her needs. She's not 'independent' enough to be living where she's at; she needs a true senior Independent Living building where she has no such expectations of her. Preferably, with a continuum of care where she can move into Assisted Living if and when the necessity arises.
In the meantime, figure out what other family member or friend can have a key to mom's car and go move it for her after a big snowfall. That seems to be your only other alternative.
Good luck!
Actually, I think the landlord would be better off creating a specific area for winter storm parking. Cars could be moved there, then back to the cleared area afterward, especially since from what I've seen, parking lots are cleared more than once after a heavy storm.
Another alternative if there's someone in the complex she trusts is to ask that person to move the car, and provide some type of nice thank you gift and a thank you card.
Moving a car through a 20" snowfall is not only difficult, and challenging, but it's not sensible. Someone could easily get stuck and create a blockage for the plow and other residents.
Perhaps someone in the complex can suggest this to the landlord? And unless someone has a vehicle or truck equipped with a snow plow, I can't even envision how someone could drive through 20" of snow.