Hi my daughter will be 9 in march. Just recently she's just started being really cheeky to me and ignoring me if I tell her to stop doing something or telling me "no". She's becoming quite argumentative. She also says cruel things to her little sister. I know siblings are just like that sometimes though. She usually gets things taken away from her if she's cheeky or mean or she gets sent to her room but it hasn't helped. I've tried talking to her to see if there's anything bothering her like at school or anything and she says there's isn't. What can I do?