You need the advice of a real estate attorney.

My guess is the appeal doesn't stop the foreclosure process.
Your client probably risks getting their furniture put on the curb.

In my experience very little can be done to stop foreclosures. I've seen clients try many different venues and avenues and I haven't seen anything work successfully other than agressively trying to sell the home. That's not intended to keep them in the home longer, but give the lender a chance to get more buy selling it as an occupied property and save money by not going through the foreclosure process. Good luck.