Puppy leaking urine in sleep

Hi all, my wife and I adopted our puppy in August of last year when she was 8 weeks old (so she’s about ten months now). She had already been fixed by the shelter before we met her, which means she was fixed considerably younger than the recommended age (not our decision). Since her adoption she has had recurring episodes of peeing in her sleep. She doesn’t seem to know it’s happened until she’s awake (she is never punished or scolded for this behavior, she can’t seem to control it), at which point we take her outside and she usually pees a bit more. It’s usually enough pee to soak whatever she is laying on, it’s not just a dribble.

What’s strange is that the incidents tend to happen in groups; she will go weeks sometimes without any occurrences, and then it will happen 2-5 times in 2 days. It’s more likely to happen after she’s had a lot of exercise (which usually means she chugs some water and then sleeps heavily, makes sense) but sometimes it also happens out of nowhere, or even right after she’s been outside and peed.

We are currently trying a low dose of estrogen prescribed by our vet to see if it will help her bladder tone and sphincter control, but it doesn’t seem effective so far (just a couple weeks in). We will try Proin next if estrogen fails. We love her dearly and she is at no risk whatsoever of rehoming or punishment for these incidents, but we would obviously like to curtail them if possible.

The assumption is that she has a decreased bladder tone/sphincter control due to premature spaying. However we wanted to pose the question to you all anyways on the off chance that someone has dealt with something similar and found an alternative solution.

Has anybody had any similar experiences with their dogs and can offer any advice?

Thank you so much!