You have to have your sanity at 1 red bar for Ari to assault you. Otherwise she ignores you. I had to intentionally drain my sanity at the beginning of night 4 to see her h-scene. They could probably bump it to less than 50% sanity instead of less than 20% because yeah most people wouldn't stay at 1 bar for too long.
Yea that's what I thought and I tried but it's so tough to do when the other girls come to the window. Feels too situational? I had mine at one bar white since keeping it at one bar red is so risky and when you run out it's just a flat game over (which again I think is kinda lame and should just lock the doors at that point since your character has no sanity and let the horny won meaning they accept their faith but could still pass the night if lucky)