Oh? My understanding so far was that she claims to have wanted to visit a friend in the USA, and is only accused of wanting to work. Can you please pinpoint to me where you got the information?
She lists LA like a tour date in her bio. I'm not sure if that already qualifies as intent to work in the eyes of border patrol though. But it might.
I personally believe that just an accusation is NOT enough to justify that treatment. In fact I don't believe that even if she did intend to work the correct thing would have been to send her back. But an accusation?!
Her social media has shown she was working as a tattoo artist on tour in LA with dates - direct violation of the VWP because it's an employment role.