Your legal question is why did she do this to you?

How could anyone, besides HER actuallly know the answer to this?

If you are asking if she did something wrong legally, the answer is no.

If this company conducts business in the manner in which you have described it, you dodged a bullet. In all likelihood, the company isn't managed any better than its personnel department. If it's that much anguish just getting hired, imagine how difficult it is to actually WORK there.

People get turned down for jobs every day. Find another.