Right, the key phrase is she was not arrested. She, and the other degenerates could be arrested for doing this thing. People have been jailed for just asking questions to the politicians, much less acting like maniacs like these degenerate protestors.
So she forfeited her own coat by disrupting the political event. She should have been thrown in jail, but Trump merely requests that they be escorted out of the venue and to have their coats mailed to them later. Tis not theft, they brought it on themselves, and frankly they got off light.