First welcome Libra, glad you are with us.
I am sorry to say that I know what you are going through, because I did it to my family. When I became a JW, they teach you over and over, that those that are faithful will leave their father and mother, and who loves their family more then God is not worthy of him. So you are correct she is pulling away from you. You are taught paranoia...the world is against you..and if you are not a JW then you are in the world. Translation: If you are not a JW then you are not worthy to associate with, because after all if you are in the world you will die...period. So active JW's pull aways from their "worldly family" so that they do not feel sorry for you when you are killed by Jehovah.
It is so sad for family members who watch this happen to those they love. It is like addiction problems, you watch your loved one over and over destroy themselves, but until they can see what they are doing, or they reach rock bottom, no matter what you say or do they do not listen. It is exactly the sameway in a cult. You can tell them, beg them, show them proof that what they believe is inaccurate, but until they themselves see what you are saying, it is a waste of your energy.
You and your family need to raise above their behavior, and still show love and consideration. It is the only way you can keep guilt away from yourself. No matter what she does you know you did the best you could.
Good Luck.
Leslie