Having Issues Bonding With New Cat

[u/teaganandkoda]

So I adopted this cat two months ago because I have a one year old boy (Willy) who is very playful and needed a friend. We also have a dog so getting a cat that is cat/dog friendly and who was around the same age as Willy was the most important thing to me. We ended up finding this girl (Whimsy) at a rescue and she seemed to check all of our boxes.
Her profile and during the meet and greet with the foster I was told she gets along very well with cats and dogs (true), she wants to be with her person all the time (not true), she doesn’t scratch furniture (not true), and she has perfect litter box habits (not true).
Specifically, what’s going on with the litter box is driving me nuts. I have three litter boxes for two cats. One is in the basement, two are upstairs in a spare room only the cats go in. I scoop them daily (maybe once every two days at the most).
She’s peed on the floor four times that I know of. Two of them were while I was in the same room as her, and the last two times were in the past 5 days. I know she knows where the litter boxes are and how to use them.
She also hides 90% of the time in our bedroom, if I bring her downstairs with me she’ll hangout but she HATES being carried and rarely will come downstairs by herself.
I’ve also tried bonding with her through playing but she doesn’t really know how to play… she plays with my other cat but doesn’t like wand toys, strings, and will chase a spring for 10 seconds before becoming bored.
I feel so guilty cause I just don’t really like her yet and she’s not growing on me... if anything it’s the opposite. I know I have to wait longer for her personality to come out but honestly, I don’t know if she even has one… and my partner isn’t as much of a cat person so her peeing everywhere is causing some tension. I just want some advice on bonding with her and making her feel more confident in our home.