Thanks for the information. The first thing that needs to be done in instances of inappropriate urination is to have your vet rule out any potential medical issues if it hasn't already done. Routine blood work and a urinalysis is usually necessary to rule out potential issues such as a urinary tract infection (not common in young cats), feline lower urinary tract disease (FLUTD), bladder stones, kidney problems, liver problems and diabetes. Sometimes when a cat is sick, inappropriate urination is the only way that they tell you they are sick. From there, if everything is normal, then we tend to deal more with behavioral issues. Anxiety is a common cause. If there are any other cats in the household, stray cats outside or new people in the house, that can sometimes cause this. Anything that will change her routine and environment. Stress is usually the cause of FLUTD. If she isn't spayed, I would definitely get that done in case she is marking. I know that this will sound incredibly stupid, but I have seen some instances where an owner has had a cat for months or years and didn't realize that what they thought was a female was actually a male cat. I know, it sounds stupid but just throwing that out there just in case. New clients of mine had a cat for 12 years they thought was a female and ended up being an un-neutered male. Make sure there wasn't any change in the type or brand of litter or any alteration of the litter box before this started. The rule of thumb is to have 1 litter box per cat, plus one. If she is your only cat, you need two litter boxes. If the boxes are covered, I would consider uncovering them. Make sure the boxes are in an area that is not in a major traffic area but where they can still view their surroundings. Make sure they are not next to loud appliances as well. If there are multiple cats in the house, it may help to keep her in her own room with a litter box to make sure another cat isn't blocking her from it. Scoop each litter box at least daily and clean once weekly with soap and hot water. Many cats can be very picky about the cleanliness. It can come out of nowhere as well. No harsh chemicals to clean either. Try putting the litter boxes where she has been urinating at. When you clean the areas, make sure you use a product that specifically says it neutralizes or eliminates pet odors. If it doesn't say that, they can still smell it and will go right back to it. If it is a carpeted area, it can sometimes get into the carpet pad, and that may need to be replaces. Lastly, consider getting a Feliway diffuser and putting it in the rooms she is urinating in. It is a synthetic cat pheromone that helps to relieve anxiety. Some cats may even need to be placed on anti-anxiety medication for inappropriate urination. This is one of the most frustrating things we deal with in cats and may require trying multiple things until you can figure out what works. That is why it is so important to rule out any potential medical issue first. Please let me know if you have any other questions or concerns. Hope this helps.
My goal is to make sure that you get all your question answered and all the information you need. If you are satisfied with my answer, PLEASE RATE IT. Rating it is the only way I get credit for helping you. If you feel like it is not helpful to you, or if there is more information you need, please respond back to me before rating. Realize that our conversation is not intended to diagnose or treat a condition. There has to be a valid veterinary-client-patient relationship established with an exam, according to law. You should always follow up with your vet.