I'm upset with her
What is your reason for being upset with her?
She was flirting with me just to get me to do her work for her.
It is understandable that you may be upset with your friend trying to get work done for her just by flirting. Try to ask yourself though if maybe she was just playing around or trying to be humorous. It really depends on the context for a situation like this.
It's obvious she used me. I'm going to play the victim card to get further revenge on her.
Well feeling used like that I am sure is not a great feeling. You should let you know how you felt when she did that so she clearly understands what she did to you.