Alarmed, she quickly logged in, “only to find that all of my accounts had disappeared and my balance showed zero dollars.” It seemed that Fidelity had eliminated all traces of her longstanding financial relationship with it, erasing the tens of thousands of dollars she held in three accounts, including the Roth individual retirement account that her father had set up for her when she was 16 — and where she had made regular contributions ever since. Her online statements and tax documents had also vanished, so she couldn’t immediately find any of her account numbers, she said.