I would agree as long as they sign an agreement that they will pay for professional carpet, furniture, and equipment cleaning for each accident. Get quotes from a company that will do THAT DAY cleaning and have the parents pay a cleaning deposit so you have the funds to pay for the service every day. If they are certain she is accident free the money will stay untouched and you will return the deposit to them when she is 30 days accident free.

Time to put their MONEY on their expectations. Now they are only offering their words. They need to agree that they will fund professional cleaning and immediate replacement of any furniture or equipment that she damages.

So you say yes to their wishes as long as they are willing to pay for each and every accident she has. The cost of one professional cleaning will be the same as six months in pullups. It might be better for them to just risk pullup money instead of cleaning money. Your problem now is that they are not risking any money. Have them risk MONEY instead of saying words.