Nope, She's right to be upset. Hope they at least pay her for the full day. Work an 8 hour shift to see if you're a good fit? Sounds like they've already determined she's a good fit if they're so sure she wont spent 8 hours fucking shit up. They could technically pull this stunt for every applicant and never pay for work. I wouldn't be surprised if the job isn't even real and they periodically scam free work out of people this way.

Interviews are interviews, work is work. For anyone who disagrees with me, I'm offering $500 million dollars to come clean my house. First the interview though, come over, work an 8 hour shift, and then i'll decide if im going to hire you.