In that case it is not actionable because it's hyperbole and/or a statement of opinion. An opinion cannot be proved true or false, and therefore it cannot be the basis of a defamation lawsuit. You would have a cause of action only if she made false statements of fact which caused you some type of damage or which are so disparaging (called "defamatory per se", such as false accusations of severe crimes, false attributions of moral turpitude or of professional incompetence) that damages don't need to be proved because they are presumed.

