She's trying to set up a claim for police brutality. Anything that'll get the DA to drop charges because she's more trouble than she's worth.
Dennis: Oh! Come and see the violence inherent in the system! Help, help, I'm being repressed!
Arthur: Bloody Peasant!
Dennis: Ooh, what a giveaway! Did you hear that? Did you hear that, eh? That's what I'm on about! Did you see him repressing me? You saw it, didn't you?