I'm not saying that I agree with the woman on keeping her children locked in the house all day, I was just trying to give my idea on why she would. When my daughter is that age, she wont be locked up in the house, but I WILL know who and where she is and she wont be running the streets with a bunch of boys. If she wants to go to their house, that's fine if the parent is there, but not if they aren't home. Teens don't always look for a bed to have sex in, they can do it anywhere, that's when they are the most risky as well, just because they don't have a bed doesn't mean they wont do it outdoors, so maybe the mother is just worried about that. Even if the girl isn't sexually active today, it doesn't mean she's not thinking about it and wont be tomorrow.
I agree that young girls should be brought up to be strong women who will resist temptation, but she is a young teenager and you can't trust young teens to be 100% responsible all of the time, it's like wishing there was no more child abuse, it would be an amazing and incredible thing, but it wont ever happen. If my mom didn't trust me so much when I was younger I wouldn't have made the many mistakes that still effect me this day. But she let me run the streets with boys and everything and it really messed me up for a long time.
I do believe you are a responsible woman, but maybe your neighbor has trust issues or something.