Gag her

"Okay that's enough noise out of you. Quiet-time now, the boys are talking." You say glibly, and put your indexfinger against your lips to indicate silence.

"You son of a b-"

You interrupt her "Nuh-uh, zip it!"

You wave your hand across her face, and as if by magic an improvised gag of a strip of fabric is stuffed in her mouth once your hand passed. At least, it'd look like magic to an onlooker, but you simply used your superspeed tactically to create the effect.

Cira quickly gets over her surprise and muffles angry protestations into the gag, but it's considerably less disruptive than the full-throated shouts and insults. Gosh, you love putting people in their place.