I'm going to ignore her calls and texts until she leaves me alone.
Why are you going to ignore her?
I don't enjoy being around her anymore, she's very negative.
I'm sure you find her annoying, but you should explain why you don't want to spend time with her anymore. Just ignoring her is confusing to her and not an appropriate way to handle your issues with her.
Fuck it, I don't want to explain anything, i'll ignore her, it's my life, I don't need to explain myself.
It is your life and you can do what you like but if you ignore her instead of explain things she might keep seeking you out. It would be easier and faster to just let her know.