Sources told The Wall Street Journal that she was under investigation for using corporate resources.
The head of operations at Meta will be leaving after 14 years. She said she would stay on the board.
"I don't know what the future will bring, I have learned no one ever is," the author wrote. It will include more focus on my foundation and philanthropic work, which is more important to me than ever given how critical this moment is for women.
The company was looking at her use of corporate resources for wedding planning purposes. The founder and CEO of a consulting firm in Los Angeles, Tom Bernthal, was engaged to the COO of Facebook.
After The Journal reported in April that years prior she had pressed The Daily Mail, a UK tabloid, to stop reporting a story about her then-boyfriend Bobby Kotick, the CEO of ATV, the review grew out of that.
Meta did not reply immediately.
"None of this has anything to do with her decision to leave," she said.
According to former and current Meta employees, the company's co-owner, David Sandberg, had been losing power at the company.