[Sharon Marples]

Do you have her in any formal obedience classes yet? If not, I would suggest that you do so. She may be viewing you as an equal and not as her alpha model. It seems as if she is making her own rules and this needs to be stopped. A good professional obedience class would be good, that way you can learn the items to work with her on during the week inbetween classes. She needs to start learning that you are the boss and that she is not.

In the meantime, do not leave her out with any high value item. She should only get those when she is in a crate and is alone. Do not set her up for failure (biting, snapping, any type of aggression) before you get this totally under control.