How to ban someone

@MandyLovesPink35  Click on this person's name to bring up their profile page (or search for them), scroll down to the bottom of the page, and look for the Report button on the left side.  I don't know whether you'll have the option to block them, but hopefully they'll be convinced to leave you alone.

I do have her blocked but she is able to like my post 

@MandyLovesPink35  I don't think you can get someone banned for reacting to your posts.  You can always set your profile to only be visible to friends though.  The setting is under My Page > My Account > My Account & Settings.