That is so scary. I'm glad you are being proactive here!
I think the above tip is good too. And, I think buying a muzzle leash and giving it to her is not a bad idea. Maybe she'd use it?? You can always write a nice note saying you would hate for anything bad to happen to any person or pet and just wanted to help her out. I don't know...sounds like she has an out of control dog. Scares me.