Yes! But it's a dd. SHe turned 10 last week but the rot started at 9. Sarky, rolling eyes, back chat. Like you said, lilymae, she's polite with other adults so I don't mind.
Her little sister imitates dd1's favourite sayings - 'face it', 'admit it', 'come on', 'more to the point' - all said in sarky, know-it-all voice.