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For invitations you can buy Cheetah Girl themed invitations online, or you can buy blank cards that have cheetah print on the front. Then all you have to do is write the party info on the inside.

For food, have lots of snacks and candy, and of course cake. There aren't any places that make Cheetah Girls cakes, but you could make cupcakes and put Cheetah Girls rings in them. That way, each girl gets a cupcake and a ring. For snacks have different kinds of chips and dip, popcorn, trail mix, lots of kinds of candy, an ice cream sundae bar, and maybe mozzarella sticks. You can just get cheese and pepperoni pizza for dinner.

As for decorations, I have some links below where you can get Cheetah Girls themed cups, napkins, and plates. Anything that you don't get with the Cheetah Girls theme, just get cheetah print. That still follows the theme. Have black and yellow streamers or cheetah print streamers. Also get some balloons in cheetah colors, or in pink and purple if your sister likes girly colors. (You can do that for the streamers and table cloths too.)

For party favors you can get Cheetah Girls themed stickers and pencils. Then, throw in some candy, little bottles of nail polish, fun dress up jewelry, maybe a feather boa, other stickers, some body glitter, anything fun and girly would work.

Here are some links:

CUPS, NAPKINS, STICKERS:

http://www.birthdayexpress.com/browse/_/N-i/Ntt-ch...

POSTERS:

http://www.amazon.com/gp/product/B000LDBWFS?ie=UTF...

RINGS:

http://www.partyimagineers.com/4chgiri.html