Sibling loses contact with sister

DEAR HARRIETTE: My sister won’t answer my calls or call me back, and I have no idea what I did wrong. She has never been great at communicating, but now she has gone radio silent. At first, I thought she was just busy, but it’s been a while now, and I’m starting to worry that something is really wrong between us. I’ve tried texting her, leaving voicemails and even reaching out through social media, but I haven’t gotten any response. Unfortunately, she lives across the country from me, so I can’t just visit her house.