You are giving her control by even listening to her and communicating with her, even in a negative way.. DO NOT play her games, do NOT participate IN her games... NO MORE communications with her! Avoid her "block", avoid any contact at all... It takes two to make a arguement, two to make a situation and two to keep the arguement and situation going.. Tell your other friend the same and don't you two even discuss her anymore between yourselves. That should put a end to it REAL quick.... (Unless you live on the same block)