I think she was really harassing people to get them to react.
She had a cardboard box sign that she had scrawled Republican for Biden on.
Who takes that to a Trump Rally?
She was looking to start trouble IMHO.
Because it is a privately paid for event, anyone can be asked to leave at any time. She was being disruptive and, it seemed, was disruptive so she got escorted out. She will probably be a rock star now on her social media accounts