Concur with both jk and Mr. K.
Really, about all your friends have is the opportunity to defend themselves in an unlawful detainer suit, should one go forward.
Not only is an IIED claim unlikely to go anywhere, neither is a defamation claim, and both are incredibly expensive actions to bring forth to begin with. We're talking multiple thousands of dollars, usually over multiple years.
I understand that your friends are angry and upset, and they certainly have every right to be. But there is no law requiring the landlord to apologize, and no law requiring her to not be an unmitigated jackass.

