Any recommendations on a creative way how to make money?

My lil sis is 11 and wants to make money. She loves art and animals. Any idea on how to make money with that?
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Lemonade stand....but with a twist.......sell cookies too!! Charge enough to make a 300 percent profit.
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I don't know if you have heard of it, and honestly she will need an adult to help her, but there is a great site called Etsy where you can sell things that are homemade. If she is a great artist then she may be able to sell her work there. Check it out! I'm actually quite addicted to that site. I buy from them all the time.
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Lemonade stands are great for her.
She can't really do anything.

I'm 13, and i am starting a lawn mowing business.
Shes too young for that.

But, anything else can work.

She can ask to rake leaves in the fall, but that's all she can do.
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Time to break out the ol' thinking cap