Being able to see her pattern and know that you are breaking the cycle is huge! If you know that she is not supportive, stop telling her things. Set boundaries, just like you are doing with not re-friending her on Facebook when she has demonstrated that she doesn't handle that appropriately. Maybe when she realizes that her criticism just gets her silence and less contact with you, she will decide to work on how she interacts with you. Maybe she will never change. If she doesn't change, you get to choose how much chance you give her. You could invite her to a family counseling session together and spell it out for her if you think that it might help.