Any good ways for a 13 year old girl to make $4000 over the summer?

[Cara]

first of I am not a spoiled kid who wants money, I am raising money for world challange, if you don't know what it is it's a humanity trip where a group of people go to two diffrent third world countries in one month and help at places like orphaniges. I am going in 2014 but the money installments need to be payed by 2013, I turn 14 at the end of the year so I can't get a job and ern money that way, I need some ideas really bad since I need at least $990 by Feburary, also I live in Australia.