My lilac crowned is 12 and with me since weaning. I've bragged often and recently that she's so steady that I've never seen even a hint of sexual maturity in her behavior. Well, I won't be saying that again

Last Thursday she began flying to other birds' stands and attacking them, even flying after them as they try to escape. She's had to spend an inordinate amount of time in her cage so her flockmates aren't abused. When it's her turn to be out, she always wants to be on the stand nearest me, and then on my hand, and then my shoulder. I realize she's wanting to love me fiercely, but because this behavior is so new, I know better than to trust her to not overload and bite in her excitement. She's full of fluffing and pinning and saying "HIIIIIIII!!!!!" in an exuberant voice

But my hand is still healing from the first hard bite she's ever given me -- as I tried to break up a fight she provoked with a tiny quaker girl. So, I keep removing her from my shoulder and not cuddling her without protecting my face and the girls. I've always cuddled her with my hand cupping her head and face, while she leans her beak against my chest, but I'm being especially careful this week to never let my hand slip lower on her body.
I've never known anyone else with a female LCA so I'm wondering if anyone here can give me any hints of what to expect. I know 12 is quite late for a first hormonal surge, but I handle her too much daily to have overlooked this for years. She's been flighted only a year or two. Could that freedom be contributing to the intensity of this? She's enjoyed flying so much that I'm extremely reluctant to clip her, but will if she continues to attack the other birds more than another few weeks. I'm very hopeful this disruptive behavior will end as suddenly as it began ... and FAST!
Any info or advice will be most appreciated.