You need to continue with the structure. She needs consistency and predictability. She will push back against structure and rules and discipline. But she still needs it. Giving in and not having consequences for behavior will make it worse not better. Are you putting her in another space away from you when you are doing time out? Don't do that. Use a consistent time out space, but one that she can be in the same space as you (ex a corner in the kitchen while you do work in the kitchen as opposed to her bedroom).