Lauren Shuler Donner was more than likely getting hit with some social media shrapnel from the Dark Phoenix flopping news, which prompted her to respond in a rather negative way.
Dark Phoenix is more than likely the end of the X-Men franchise as we know it.
Lauren Shuler Donner has made it abundantly clear she is not satisfied with the current state of the X-Men movies.
However, she has now distanced herself from Dark Phoenix, New Mutants, and X-Men: Apocalypse.