Sorry to hear she was not very understanding,look at it this way its only two weeks.Finish, your time there, take a couple of days before your new job and relax.If your boss is truly professional,she will think about her reaction cool down, and not make the remainder of your time bad.. After you leave you could always send her a thank you card or a small arraingment of flowers, thanking her for the time you were there, no hard feelings.