I'm going to cut a coworker out of my life over what she claims is a trivial matter
Do you think she is making a good point?
I'm not going to listen to her.
You need to get along better. You work together and need to be more respectful of each other.
I'm going to ruin her life.
That seems extreme. If you don't want to work it out, then just ignore her, don't ruin her life.