This is a tricky one, the parents seem to think there child can do know wrong, and is always right, being a parent myself i can`t understand there atitude because when there daughter gets older she will only get worse, and she will probably have no friends (seen this in my childhood) as no one wants to be friends with a spoilt child who thinks she is always right.

Make a sticker chart, and take her to the shops and let the child pick some stickers she likes and when she is good let her choose a sticker so she can stick it on the chart, and if she is naughty draw a sad face on the chart, at the end of the week if she as enough stickers buy her a little treat nothing expensive just something to show her she as been a good girl, i did this with mine and i saw a big change in there behaviour goodluck.