Help! 9 year old has an attitude

Our 9 year old has been extremely emotional the past few weeks, especially the last week. She gets angry, cries, complains, screams and has tantrums every day. We've tried gentle parenting, sitting and talking through her emotions but nothing seems to help. Tonight has been exhausting. She's been screaming and getting upset over everything- plus getting rough with her brothers. Desperate for advice!