Tā bù yuànyì hé biérén fēnxiǎng, zǒng xiǎng dúzhàn suǒyǒu de wánjù.
She doesn't want to share with others and always wants to keep all the toys to herself.
Tips
usage
The idiom 独占鳌头 ('to stand alone on the turtle's head') means to come first, to be the champion — from the imperial exam tradition where the top scholar stood on a carved turtle head.