[One of a kind]

I have a friend that was really intereted in becoming a member of a specific BGLO. She attended the rush and in her horror realized that one of the members of the particular chapter was the ex-girlfriend of her recent boyfriend. My friend, let's call her Jane Doe, has come in contact with the member (who we'll call Mary) on a few occasions prior to the rush and Mary has given her nothing but the cold shoulder despite Jane's attempt to be cordial. Mary did not take the breakup with the guy well. Although Jane felt she had what it takes to TRY and go through with the process of becoming a member,she decided to not go through with it because she felt Mary would undoubtedly get her ruled out as a potential candidate. (I hear there's a voting process involved.) I knew how bad she wanted it and could not believe that Mary could have that type of power to have her "black listed". Does this type of thing actually go on as far as a member holding a grudge against a potential member? I do not know much about BGLOs or their processes so if any of my wording is inappropriate please excuse me.