she sounds like Darcy's twin!
We have imaginary friends - usually pets (which is odd seeing as she has a pathological fear of all living creatures), lots of singing to the oddest things, very demanding of my time, but when her father is around she's a phsychopath! Always in your face, talking loudly, needing you to do something....argh!
And since Nate started eating...all of a sudden she's forgotten how to feed herself.