How can I stop our 18 month old female dog peeing and pooping in the house indiscriminately?

We have an 18 month old female labrador and she pees and poops all over.

Poop has been more rare for a while but seems to have returned in full vigor.

Just today she peed in the house three or four times.

She goes out three times a day, often in long walks.

I don’t live with the family, so I’m not involved in her education.

It’s often said that dogs are a reflection of their owners, well, my mom can sometimes act the love-you-hate-you type and I suspect that goes on the dog too.

She doesn’t seem submissive at all to me (I read that submissive dogs tend to eliminate out of deference, so to speak), but she definitely is the very excitable type. That said, I do not see a clear connection between her elimination events and any prior excitement or anything of note really.

It’s just like randomly we go around the house and it’s ‘oh shit she did it again’.

Then everybody is pissed and nobody knows what to do anymore, apparently.

I feel like the education has been the best possible, she even went to a puppy school.

But the problem persists and I wonder if it’s going to subside.

I would like your feedback on this and by the way, feel free to shoot non-orthodox ideas for medications that could help. I know this might shock some, but honestly, I’d rather the dog be medicated with whatever works, than herself being subject to this messy situation. I mean, sometimes they punish her, sometimes they ignore. And the dog is subject to the moods of the family (parents and two brothers) and I don’t think it will be easy to deal with the family moods. So medication is a path I’m willing to present to them.

By the way, the vet says everything is fine. But everytime she’s locked in the place where she sleeps after peeing on the floor and cries, whatever that means for a dog, I’m annoyed, and I don’t think everything is alright.

Thanks everyone.