The term "disown" is somewhat of an antiquated expression. When you "disown" someone, you revoke any right of inheritance. So, technically all you have to do is write a will in which you direct that none of your assets will go to this individual. I don't have the time in this venue to explain how to do this. Beyond that, cut off all ties: block her phone calls if you have that capacity on your phone, block her e-mail address, refuse to speak to her in person, if she sends you any snail-mail return it unopened. If she persists in attempting unwanted contact, you can probably get a protective order but you will need to document her behavior.
Answered on Sep 23rd, 2013 at 2:19 PM