Peeing all the time

Hi everyone, not sure this is the right kind of page to post this question but seeing if anyone has any insight or possible ideas to what it could be. Training or something else? My 2 year old dog (cavalier mix) pees extremely frequently. I take her out to pee every three hours and even that’s not enough. I feel like my whole life revolves around her peeing! It’s ridiculous. And the biggest problem is she STILL has accidents in between me letting her out. Today I let her out at 11am, took a nap until 2:30 (set my alarm to 2 bc I knew I had to take her out to pee) and I snoozed from 2-2:30 because I could see her laying down. Went downstairs and took her out and she peed right away. Then came back inside and as I was going to take off her harness I stepped in a puddle of pee. It’s so frustrating! And this is such a common occurrence. She has ruined our carpets over the last year and a half (got her at 6 months) and idk what to do. I’ve spent thousands at the vet and specialist trying to figure it out and besides one uti as a puppy everything has come back normal. This has always been a problem and I’m at a loss now. She’s been on oxybutin since April of last year which has helped her go from going every hour to every 2-3 hours. Anyone have any ideas?