The best option is that Willow is a Brady (i.e. cousin, maybe she's Frankie's long lost daughter), somehow linked with Stephanie. The good thing about Willow being in the pic (though she is an odd duck), is Belle being forced to deal with her notions of Shawn and being a single parent. Really, why would she want to get back w/ him when his uncle just dumped her, and he's the one acting like a spoiled brat? For now, Willow is o.k., but SD needs to grow up!!!!