I'm going to ghost my friend after she turned me down
Why do you plan on ghosting her?
1. She caused me to lose respect towards her
If you two are having an issue, you should discuss it.  Leaving a friendship without any explanation can be traumatic for the other party.  You don't want to do that to someone who was your friend, do you?
Sure, it's for her own good.
How will she learn from it if you don't even give her an explanation? If you try talking to her, she will at least understand why you are upset.