They either searched for her profile on Facebook (not uncommon if the officer is suspicious). That or they searched her phone (also very common now). Even though there was no mention of payment, just speaking of doing work that could entail payment can be enough.
I can't speak about how she was treated, as I can't read German well and haven't seen anything in English about it. It does sound though like they did treat her very poorly. Also they should have to explain why they did what they did.
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