How do you make a disfellowship person you no longer want to have a relationship with them?

An ex sister from the congregation I attend has been disfellowship well lest just say she was living a crazy life. This past Sunday in the annucements elder mention my now ex friend has been disfellowship and is no longer a member. Now I want nothing to do with her she thinks it's ok to decorate for Halloween and Christmas I disagree. It's not ok and it should be illegal holidays have pagan origins. Today she try talking to me at the grocery store this morning. I avoided eye contact with her but my guess is she can't seem to get a hint. I want nothing to do with a demonic diabolical person. I can not speak to her or want nothing to do with her. How do you deal avoiding people in respectful way while giving them the silent treatment or gosh them?

How do you make a disfellowship person you no longer want to have a relationship with them?
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