“articulable suspicion that the person has committed”
The police had probable cause that she had committed the crime of trespass.
Explain to me how this works.
Cop: "What is the problem manager?
Manager: I asked her to leave and she didn't
Cop: But she was leaving when I got here.
Manager: Well, yes, but she didn't leave for 5 minutes after I told her to.
By leaving, she wasn't actually tresspassing when the cop got there, and was following the law.