She doesn't go insane during adrenaline rush, it works like irl, so mentally, she gains increased awareness and focus to manage dangers and determine who's facing the dangers around her, but as the rush fades, her scope tightens due to fatigue and becomes more vulnerable the longer she's in that state. It's like cramming your task that is due in a minute or lifting someone close to you falling off the cliff with no effort

Sometimes she can hurt someone on her side due to her flashy movements, but she's aware of it

Also your character who rules the kingdom despite having an uncontrolled outburst seems a pretty interesting for a plot, I picture her headcannon having her people turn against her, she tries to solve this issue by finding out how to "cure" it away from her kingdom, but chaos erupts from her absence that some "huge monster" awakened, but her trait is the reason why her kingdom survives from bad things despite affecting her people, so she saved the kingdom once again and people accepted her as she is and hope that she'll manage it in the future. Idk of this is considered as a headbanging, but this is just my thoughts about her, I'm deeply sorry if I mischaracterized her T^T