I'm not going to talk to her more
Why do you want to stop talking to her? Did she do something to upset you?
She irritates me, she never shuts up and she is so needy
It's not very nice to just ignore someone who is trying to talk to you. That being said, you're of course allowed to stop talking to someone for any reason.
I don't want to deal with it. Blah
It's your right to do so, but if they are your friend or a family member, you should at least try to explain why. In our daily lives we should strive to be more understanding and be more mindful of how we treat people.