Hi and welcome to PT. I would first take Meg to the vet to make sure that she doesn't have a UTI or something else wrong with her that might be causing her to pee inappropriately.

If everything checks out fine then I'd make sure that you have plenty of litterboxes. The rule of thumb is to have at least 1 for each cat plus an extra one so that would make 4 in your case. If you live in a house that has 3 floors then you also need litterboxes on every floor. You must also make sure to clean them out at least once every day or more often if needed.

If you have covered litterboxes, then I would take the hoods off because some cats don't like to use covered litterboxes. I had this problem with one of my cats even though he had used the covered litterboxes for quite a while. Meg may also not like the litter. Many cats don't like scented litters because it's too strong for their sensitive noses.

When I was having some peeing issues my vet recommended that I buy Cat Attract Litter By Dr. Elsey. You can buy it online or at Petsmart. Here's a link about it: http://www.petsmart.com/product/inde...767033.2845025. When I bought it I just put some of it on top of my cats old litter and they used it right away. I'm now using Dr. Elsey's Precious Cat Ultra Scoopable Litter which is an unscented litter and my cats really seem to like it.

I would also try using some Feliway Plugins and I'd also buy some Feliway spray to spray in the areas where Meg has already peed. You also need to buy some kind of enzyme cleaner so that your cats won't smell the pee areas and continue to pee there. I use Simple Solution which I buy at a pet store and it seems to do the trick.

If nothing seems to work then you may want to consider putting Meg on prozac or another type of tranquilizer to help keep her calm. I like using holistic things so I'm currently using Calm Spirit Teapills on a few of my cats. My holisitic vet recommeded this and it takes at least 2 weeks to see any affect. You can buy these pills online but I'd talk to a vet first. I hope that something will work. Good luck.