My name is Sprinkles!

We adopted Sprinkles as a kitten from Pets and Pals in Livermore, CA in August of 2020. We went for her but took Sprinkles and her brother, Mr. Big, home.
Sprinkles was very shy and has halways been the less social of the two cats.
I think this is her problem. She isn't happy in our house because it's just too chaotic.
We have lots of family gatherings, a 5-year-old that is loud and we adopted a Great Pyrenees last year.
Sprinkles, has started urinating on our couch and mats. It will go away for a bit but then come back. We have tried everything. We tried the vet, meds, calming plug ins, changed her litter box a few times. Bottom line is I think she needs a quiter more calm house. She never attacks or scratches and is a very sweet kitty.
I don't think she would urinate like she does if she was in a calmer environment.
We hate to give her up because we love her but I think for her, she would be happier in a calmer environment.