The squeaky wheel gets the grease (unfortunately) and she complained. You should also complain how she treats you so they know about it.
I went through something very similar where someone complained and got me reprimanded for something I didn’t even do as they mistook another’s actions for mine. Management wasn’t even interested in hearing me before reprimanding me. I was so fed up by that point I just quit. But I should have complained and made them hear my side of the story first, at least.