Not much to add to all of these smart ladies' answers! I have recommended Nature's Miracle to clients for years. Works great (expect it to take a few days to calm down on the smell). I like the idea of free access if you have fenced yard (ie, doggie door), or having a potty spot with litter... as it seems that maybe she has to go more often than she can tell you?

Also, if she does seem to urinate more frequently than she used to or not be able to hold it, have her urine checked by your vet... and kidneys. She could be harboring a little infection.

Hope it works out!
Jes