I agree there can be emergencies for many reasons. Running is something that can cause people to have an emergency. Thankfully this particular problem isn't one that I have, but many people get a few miles in to a run and literally get the runs. If you've ever ran a race and used one of the course porta potties you'd see it can be quit the situation in there. lol
What I don't understand is why the person would go back to the same spot to do this. It's one thing if it's a wooded area away from homes that she was using, but to return to the same house and do this seems intentional. If I realized I had this problem while running, I would plan my run routes to include an area that would not be around homes so I could have options. I think once is an emergency and you gotta do what you gotta do. Twice or more seems like choosing to do this in that spot and that is what makes it not okay to me. I'd be so embarrassed if I had to go near someone's home and would definitely plan something better for future runs.