I read the fantasy story sometime during the late 1970’s or early 1980’s. It was in a magazine. It was about a beautiful girl who was really nasty to others–what we’d call a “mean girl” today. One day, she woke up and she’d basically turned into Medusa, that is, anyone who looked at her turned into stone. I don’t think her actual appearance changed, and I don’t think any explanation was given for what happened to her, other than that she was so mean. She walked around the house, and her family all turned into stone. The thing that sticks in my mind about this story is that she had zero remorse about this, and the last line of the story was something like “And now I’m going to go outside.”
The science fiction story is something I read in an anthology I think sometime in the last decade, or maybe the 1990’s. It was about a girl or maybe woman who thought she was being discriminated against because of her sex, and wished that there were far fewer females in the world, so that men would have to be nicer to them. Of course, “be careful what you wish for, you might get it”. Somehow, either she went to another dimension where the human population was something like ninety percent male, or the world instantly changed to make that happen. But that meant that women had few rights because men kept trying to kidnap them so they had to stay indoors and not do anything dangerous. All women had to have as many children as possible, like it or not, and they couldn’t choose their husbands (or maybe have one at all.)
Both of these were definitely short stories, not books.