I agree with posts above and OP has received great advice.
Only thing I'll add to the conversation is that I don't necessarily think rehoming or giving to a rescue is the best option. It can very hard to get older senior dogs with bladder issues to be adopted out, first of all, and second, it's plain hard on the dog. In a few cases, euthanizing almost seems kinder, IMO.
I can definitely understand the frustration. I don't think I could live with a dog who had accidents all the time unless there was a medical issue that popped up of course. Just like people, dogs get older, and can sometimes not hold their bladder anymore. But that's why I worked so hard with Jackson as a pup to properly potty train him. It sounds to me like she was never trained so its just sad that is having to suffer now for owners mistakes but I don't want to shame you or judge you. We all have our limits. I will just say it makes my heart hurt a little.
