How can I make amends with my boyfriend’s ex-girlfriend?

so she has never been very friendly....going back years....she even emailed your current boyfriend, her ex, demanding an explanation as to why he was going out with you when he knows that she doesnt like you.....whenever you see her socially she is unfriendly, intimading with a cold attitude.....she talks down to you (as witnessed by others) when ever in a group setting...have i got all of that correct?....AND YOUR ASKING HOW YOU CAN MAKE AMENDS WITH HER!!!! for petes sake girl, wheres your self respect and your self esteem....you dont make amends to someone who has publically disliked you for years....hold your head up high, shoulders back....youve done nothing wrong....the problem is all hers....at the party in a few weeks, you MUST look stunning....put a big smile on your face, know your a great girl, with good friends.....and completely ignore her....if she speaks to you nicely, speak back to her....if she approaches you and talks down to you....tell her 'i have no intention of interacting with you, do find someone else to talk down to, iv e come here to have a good time with my boyfriend and mates....you'll have to find someone else to pick on'....let her start and show herself up for the horrible piece of work she is....good luck with it all....please please please dont bow down to this bully and try to kiss a$$...your better than that and you know you are x