I'm not going to invite an established member of my friend group to an event I am hosting
Why would you not invite her?
I just don't feel like inviting her.
How would you feel if that person did that to you. Just invite that person and maybe you will have change of heart after getting to know them.
I'm going to ignore that this conversation ever happened and block you from messaging me.
I am just trying to help. Sometimes it is helpful to put yourself in someone else's shoes for a bit.