I'm thinking of ghosting the best friend I've had for the last four years.
Why do you want to ghost your friend?
I just don't feel any connection towards her.
It is okay to want to move on from friendships. However, you should end the relationship in an adult way and not just ghost them.
Since when did being a teenager become a crime?
Being a teenager has nothing to do with treating others with disrespect. You can let your friend know how you feel instead of ghosting them.