Back to square one with Macie

Im not sure what has changed. I have been more attentive to her. Taking her to things with me, working less. I have kept consistent chore schedules with her, given her time to play. It seems like she has started pushing the boundaries again and I have pushed backed with punishments. She has gone back to yelling, arguing, fighting, whatever she can to cause problems and chaos in our home. I don't get it, don't get her at all. I spend hours at night fighting with her about chores, taken things away, putting her outside for timeout... she will look right at me and "say I don't care. I don't play with that, I don't play with that. You wont ground me, keep me outside for 5 hrs i don't care." I am about to lose it with her. I don't know what else to do.