Rather than a gift-basket, why not get your sister a gift-card to a beauty-product retailer like Sephora, Neiman Marcus, Saks, Barneys, Bloomingdales, etc... along with a card good for one Girl's-Day-Out with her sis? That way, you and your sister can have fun trying on different products and looking around; if she likes something, she can buy it right there or get a sample to try it out instead; there's no pressure to buy and no gift-receipts to fiddle around with (in case she doesn't love something in the basket). Not only will your sister get to take home some makeup, but the two of you will get to take home some really great memories.
I thought of that Roxx - but I don't get to see her often and don't want to spend the time in the mall.
She gets confused in Sephora. She doesn't have the patience and is totally undecisive so needs someone to do the make up shopping for her.