Debating to Rehome a Microchipped Dog vs Trying to Make it Work

this dog has a pee problem. when i got her she refused to pee at ALL. holding it in for like 20 hours the first day. She uses the wee pad, but leaks everywhere in between. If she's excited to get out of the crate, she will leak on her way out of the crate and all over the floor. if you pick her up she sqauts and starts peeing. If you reprimand her she squats and starts peeing. It's like this weird... reflex. A trainer told us its prob submissive peeing. She's been peeing more outside but oh my god, it takes hours of walking her. and i need to have my own fucking life too. Today, i took her out of the crate to pee on wee pad... she pees on my rug... a rug she hasn't peed on in the two months ive had her. she just suddenly... decides to go there, leak all around the floor. i've tried taking her out immediately upon waking up.. she leaks on the steps on her way out... i tried carrying her.. leaks as i carry her... i tried taking the elevator.. leaks in the elevator huge pools...

my partner, a dog nutter (i didn't know),thinks i need to walk her for hours and give up much of my life and stress towards this dog that will die in 10 years and leave me with extra wrinkles and gray hair from the stress.

the dog is honestly a sweet girl, she has excellent recall, and has been good at training in other ways... but the peeing thing... has been IMPOSSIBLE.

i am considering rehoming, but who will want a dog that pees all over the place? i also got her from a shelter and in the contract it says you cannot rehome the dog... but they are also a horrible shelter with some shady sitaution and a fake non profit.. AND they are notorious for not taking dogs back n yelling at your for even thinking about it... long story, i do not want to interact with them again. but she's microchipped. wtf do i do? i've made such a terrible mistake. i wish i could time travel and slap myself and tell myself to NOT DO IT.