i need help with ideas..

[Niall]

move house before she wakes up.

That would be as funny as purely for the amount of effort put in for such a small joke.

I normally find the little things are th funniest like swap the hinges over on her door so it hinges from the other side or spin the light switch 90 degrees so she has o push the switch sideways to turn the light on.

Or if you wanna be a mean bastard, put itching powder in all her clothes and bedding or rip all the heads off of her childhood toys and put them on spikes on candles on a cake in her room and light them