Shadow of the Sphinx

When Paige attempts to keep up with her sisters Piper and Phoebe, she finds that her powers backfire and she accidentally shapeshifts herself into a cat. If this wasn't awkward enough, Paige is then abducted by a mysterious cult that worships Egyptian deities and is transported back to Ancient Egypt. It's up tp Piper and Phoebe to bring her back and restore the Power of Three - that is if they can find her...