The crossword solution for the term SHE MIGHT BE BESIDE HERSELF is CLONE, which is a five-letter word. A CLONE is an organism or cell that is genetically identical to its parent. Cloning has been used in science and technology for many years, and it is now possible to CLONE animals and even humans. Cloning can be used to create exact copies of organisms, which is why the term 'CLONE' is often used to describe someone who is very similar to another person. In this case, the term SHE MIGHT BE BESIDE HERSELF could refer to someone who is so similar to another person that they are almost indistinguishable.