Since it's been four months, she's probably using that spot now out of habit instead of for the smell. Since cats will not soil where they sleep or eat, the best thing to do is put her food there. And don't put her litter box in the area (you indicate it's near) because that will reinforce to her that that's where she's supposed to be peeing. Of course, with that many animals, and since it's your living room, it may not be possible to move the feeding area, but if it can be done it's worth a try. When you think she may have broken her habit, start putting food back in the old feeding place, but keep a bowl in the pee spot, too. Start removing it for increasing periods of time until you are sure she is no longer interested in that area as a bathroom. If this doesn't work, or it is not feasible in your household, a large object covering the spot and/or a can of Feliway may be your best bets. Good luck, this is the most frustrating things that cats can do.