If worst comes to worst steer her into the suicide stage or do what you can to kill her when shit gets real. Man that guide is handy. And since it's a game you don't need to catch her off guard... unless she is secretly being played by an actual yandere somewhere near you.
"It's snowing women." -Tsukika.
There are two things that I will always laugh at: "Yuno F***ing Gasai" and something else.