(1) She does have the right to fuss and "make a scene" if she believes she has a legitimate complaint. (2) She left the establishment, and said that she was fine with not coming back.
It all depends upon how long. I am sure she “fussed” for a while after management listened then explained their view of the situation and options before management got tired of hearing her and asked her to leave. Then there was the time “fussing” between when they asked and called the police. I suspect you can add more time “fussing” after the police were called.