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So my sister recently sprained her TOE, and my parents are flipping out. They bought her crutches, are acting like her total servants, and basically making a bigger deal out of it than it needs to be. Even my DOCTER said she didn't need crutches. She actually advised AGAINST them. It doesn't help that she's the younger child. I KNOW that my little sister is the type of person that would fake an injury to get something, because she's done it before and told me about it. Due to my sister's MASS overreation, I can't carpool with my friends anymore because my sister doesn't want to have to drive with them anymore, and because she's the cripple, what she says, goes. And I have a NASTY attitude now, because NO ONE believes me, and I KNOW I'm right because I heard her talking about faking it to one of her BFFs. And since I have this nasty attitude, I'm looking like the big evil older child who gives no sympathy to the poor little cripple girl with a sprained TOE. Help me out here.

that's super tricky.  Unfortunately, all you can really do is wait it out.  She can't fake a sprain for very long.