Let her have one you grumpy old sod.

When she gets to 13 she probably won't even speak to you for months at a time...just silence or screaming....

Be nice to her whilst she's still reasonable

Do what my dad did to me....the week before xmas yearssss back he let me open a game for my sega master system 2 (that I wasn't given until xmas day). Scheming bastard. lol