I have not experienced this myself but what your describing sounds like a child that either has some form of physiological problem or self control problem.
In other words children that physio problems are not so much upset with you personally but with the fact that they could not control that aspect of their life so they lash out. They don't seem to have a sensor for the pain they are inflicting in the same way we do. They are often extremely intelligent--that is why so many of them become so manipulative.
I would take her to a specialist. I would ask for a referral from the pedatrician and from other sources. See what names pop up consistently. For instance for me it would be in Shreveport as there is a very good facility there.
I think there are good ways to deal with this but I would do it now rather than later.
Good luck
ts