Thanks everyone. Yes, this was a case of a tenant with a fair-to-good tract record who seemed to be telling the truth. But I wasn't sure. She said she needed the extra day but I wanted to hold her feet to the fire so that the extra day didn't turn into 2 and then 3. Since I wasn't sure about the validity of a 4 Day Notice at the time, I didn't do it and just trusted her. But I wanted to know for next time. BTW, she did come through and pay as agreed.