My sister has done the same thing to me. She sent me an email saying she would only contact me in cases of family emergencies or important health matters, etc. She then didn't bother to tell me either time my grandmother had a stroke. One of them I found out about only a week later, after my gran had been released from hospital, and only because my gran (non-JW) rang me to tell me.
She then said she wouldn't even do that much anymore, and that my parents would send me a letter (they don't use the Internet, not even email) if anything important came up. Again, no letters or notifications even after serious health issues.
Last email I received from my sister was quite nasty, and she accused me of not treating her like a human being, which I found rather ironic.
Sorry you're going through the same nonsense.