Is there a time limit for selling your parent's house before they move into assisted living?

You'll need to pay the monthly payments, so the time limit would be how long can she pay without money from the house? The type of housing she moved to will make a difference. If it is government subsidized, they will likely place a lean on the house if she runs out of money before it's sold. You'll have to check with them about the procedure. You also may want to see an elder attorney or estate attorney.
Carol