Female cat spraying on wall

Question
I have a 3 year old female cat who was spayed at around 6-8 months.  Recently, I found her hunched against a wall and a stream of urine was coming out of her.  I cleaned it with an enzyme cleaner and she has repeated this act several times since.  I've read up on this and if it is her 'acting out' because of seeing another cat outside the house and she is marking her territory, if I get her to stop using that particular spot, won't she move on to another spot?  I put foil down at the suggestion of a friend and cleaned the wall the last time with 'Nature's Miracle'. What do you suggest?  There is no way I can get a urine sample to the vet because the amount she sprays is minimal with most of it going on the wall, not running in the floor.

Answer
Connie,

I'm very sorry I didn't answer your question earlier but the hard drive in my computer died and I was just able to get it replaced.

If she is reacting to cats she sees outside you don't block where she is going, you block the window that she can see the cats out of.
They react in that manner because they are 'marking their territory' inside because they can't get outside to defend it.

She may also have a urinary tract infection or urinary crystals. If it causes her pain to pee in the litter box, she will associate that pain with the litter box and go elsewhere. It is a common problem with cats. You may want to take her to the vet for a checkup to rule out a medical issue before dealing with it as a behavioral problem.

Tabbi

edit: an easier way to put her in the carrier is to stand it on end and drop her butt first into it before she knows what is going on.