I'm going to remove myself from my ex step daughter's life
Is there a reason you want her out of your life?
Because her father and I divorced so I want nothing to do with them.
It's understandable that you would move on after a divorce. The daughter is technically not yours anymore and if the relationship was sour it can't be expected for you to repair it.
That's true but I still want them out of my life.
I think it is okay to cut people out of your life after a breakup. If you and your step daughter were not close then she probably wouldn't care. You need to make yourself happy.