Be the COO and get a cut of the earnings and some stock, or be the CEO and get a larger cut, and the ability to lead the show? Plus she could have been failing

Be the COO and get a cut of the earnings and some stock, or be the CEO and get a larger cut, and the ability to lead the show? Plus she could have been failing out of the COO role, or things were struggling / on-fire, and now that she's milked the role for all it's worth it was time to flee.