Ok so its childish but she is 13 and most of her DS games confuse me massively, she wiped me out on Lego Star Wars! I love Chicken Invaders (google it, free to download and hilarious!) and she has started playing it now.
She gets close but cant beat me, and I am very "HAH!!! In yer face" about it. She just rolls her eyes and tells me to get a grip, its only a game.
I think she is a sore loser 
:o