AIO for telling my aunt to stop acting like a weird creepy pedo?

I have a niece, Katie (14F) who pretty much sees me (29F) as her big sister. She told me that when her mom picked her up from school on Monday, her crush asked her mom if he could come over. Aunt replied, "oh sure! Come by anytime." He then said "you're really hot!" Aunt just giggled and got in the car. Katie knew her mom didn't mean any of it but she felt weird about it.

Katie called me Wednesday night, crying and telling me that she didn't want to go to school for the rest of the week because boys were starting to make fun of her. I told her to act like what they say doesn't get to her because they're being dumbasses. Today, a different boy told her that he was going to "do stuff" to her mom & become her new dad. Katie got suspended for punching him in the face.

Not too long ago, her mom called me asking if I told Katie to do that to the boy. I told her, "No, but none of this would have happened if you weren't acting like a weird creepy pedo." Her mom said, "Katie is just acting this way because she has a crush on that boy! You guys are just being dramatic for no reason."

Needless to say, Katie and her mom aren't in a good place right now. She wants to stay with me over the weekend because of all of this. AIO?