Most Helpful Guy
I guess she'll act weird around you. Like you'll be able to tell that she is a bit off.
Most Helpful Girl
This is my experience. If you are friends, or used to be friends, she suddenly starts ignoring you and she might be mean at times. "What did I even do to her?" is what you think. She might turn all your friends against you depending on how catty or dramatic she is. But don't be affected by it. If she lies to your friends, the truth will come out. :)