How should I make a movie for my best friend?

You could make a slideshow of memories together, and good pictures of her. Also, she could be just seeking attention, I bet she knows for sure that she's definitley not fat, but she might want attention.. people telling her "No you're really beautiful" or "Your really skinny and fit" that kind of stuff. But if you want to make a video/slideshow of her do it. Use windows live movie maker.