Alison was an idiot!
Of all the characters in the movie, Alison was the dumbest. She was an idiot and caused all kinds of trouble for the rest of the characters and she should have known better. First, she baited Max and got him interested in the Witches' house where the curse, the book, the candle, and Binx were. She should have known better. she also baited Max into lighting the candle, and later, opening the book. Finally, she convinced everybody else that burning the witches at the school would be a permanent fix. It wasn't! It was her fault. She was dumber than the two bullies.
Also, I think Sarah, the youngest witch, had a thing for Alison. I don't know if was flirting with Alison or if she had a particular hatred for Alison, but it was something. If she had fought Alison, she would have kicked Alison's saggy ass, easy.
Finally, did you notice that when the witches took off from Max's house, the blast from their broom exhaust damaged the house and knocked Alison on her ass? They couldn't touch Alison because she was protected by the salt-circle,but what if they had gotten together and directed the blast from their brooms directly at Alison? It would have knocked Alison's sorry butt through the wall and possibly rattled Alison's already dingy brain; Might have killed her.