Is she being unreasonable?

girlfriend (35) and I (34) were at Disneyland Paris last week. Before entering the park she gets herself and I a drink. I wait in the coffee shop with her, but after she passes me my drink she goes to add some extra milk, sugar etc. As such I tell her I am going to wait out wide and slowly make my way out. I wait a few minutes and she doesn't seem to be coming. So I decide to head to the park entrance (20-30 metres away) to take some pictures whilst I wait for her. All the time I am aware of where she is in case she cannot locate me. I spend a few minutes snapping pics until I see her exit the coffee shop and begin to wonder where I am, with that I head over to her. You'd think no issues, but instead she lays into me saying she didn't know where I was and that she may have got lost (forgetting that we have phones to communicate), and that I should have waited beside her. I told her that I wanted to use my time more productively and that I always knew where she was. This isn't the first time and tbh it annoyed me, she eventually apologised and we entered the park and had a good time. But this behaviour is infuriating. Firstly was she unreasonable or was I being a dick? Are we (men) expected to. just wait around? Secondly why would someone act that way? Become so agitated by something so trivial?

Is she being unreasonable?
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