kooljew
1. The preferred way to do the mitzvah is outdoors, since they cant do the mitzvah properly due to kol kvodah they were not obligated in it.
2. Im assuming that once upon a time in our history this didn’t go on. The world has changed and any girl who is Tzenuah is not always out and about. Read the story of Dina in the Torah. I would think that it is even less Tzanua for girls to be out at night.
3. What is your point, those are all indoors?