I'm going to ignore my friend and flip her off.
Why would you want to do that to your friend?
She is one of my best friends but at this moment I am angry with her.
I'm sorry you two aren't seeing eye to eye currently.  However, flipping off someone and then ignoring them is not a healthy way to solve an issue, especially among friends. You two should take it over instead.
If I flipped her off, she wouldn't see.
Flipping people off doesn't solve any problems and rather creates more. It's better to talk things out.