Question about Cat Peeing on Furniture?

My husband and I own a domestic shorthair tabby who is about a year and a half old. We also own two dogs. All of our pets are female. They all get along wonderfully and our cat often tries to play with the dogs. The cat and our one dog are actually really close and they will lay together and sleep together in their favorite chair in the living room and on the bed in our bedroom. The other dog is older and isn't mean to her, but just keeps to herself more. We recently moved into a new home and have been here since August. All of our pets have adjusted really well. However now I'm starting to have second thoughts about the cat. We have a sectional sofa in a "sitting room" in a part of the house we do not use that often, near where her litter box is. Almost every day or every other day we are finding little puddles of pee on the sofa. The puddles are too small to be from our dogs, so we know it is the cat. We have a litter box which is cleaned on a daily basis so I know that is not the issue. We have a huge cat tower for her to play on and we cuddle with her and give her lots of attention on a daily basis. It is really baffling us as to why she would pee on the sofa like this!! We don't really have a lot of toys for her, so the only thing I can think of is that she is either bored and we should get her more toys, or, maybe she is lonely and would like another cat in the house? I mean, we do have 2 dogs, and she is by herself, the only cat in the house. She tries to play with the dogs but that is not the same as playing with another cat. Or is it possible that she still just has not adjusted from moving into this new house? She never used to do this in the old house. What do you all think? Please help!!