It's funny, out of all the people in your congregation, you formed a friendship, a very close relationship by your admission, with her. Just because you were her BS (funny how Bible Study shares an acronym with what it truly is...), doesn't guarantee a residual friendship, let alone a close family like connection. Personalities and interests are undoubtedly more important factors, when forming a friendship. This is why any one of us is drawn to another. Even within the congregation, while most everyone perceives and refers to the other congregants as "friends", there are close friendships formed while others are not pursued or even avoided, on the basis of interests and personalities. When it could have been anyone else in the congregation you formed a close bond with, it was her. Her nurturing undoubtedly played a large roll in your connection as well. The description of your connection with her, sounds as if you view her as a mother. There are, however, a great many people who love their parents, but dislike them. They still talk to them, associate with them, respect and love them, despite differences in belief or opinion. So this bond you have with her obviously goes beyond that, especially since she's not biologically related. So, if the close bond, between the two of you, was only formed because of your belief and adherence to Jehovah, and more specifically the JW doctrine, why is it that there isn't this bond between you and any other congregant? Something that she fails to recognize or at least acknowledge. Something the FaDS prefers their sheep to ignore. If your friends and loved ones no longer adhere to our teaching, shun them. Put aside all of the reasons you loved that individual, ignore your natural instinct. Put them out of your mind. Jehovah will provide other friends, sons, daughters, and parents for you...
Sorry you lost your friend. Remember a real friend doesn't hinge their friendship with you on whether you believe what they believe. Some of my closest friends have different belief systems than I do, but we share other interests, and focus on those, allowing philisophical differences to just be. I hope you have friends who accept you for who you are, and continue to cultivate those true friendships, that are not in jeopardy of being severed by a mere difference of opinion, or belief.