Great question — answering as the UphillTech team:
I feel you. Copyright restrictions are stupid. They are complex and vary from country to country. The copyright owners apparently only licensed Crunchyroll to air this show in certain countries, Germany not one of them. Get a refund from Crunchyroll. And try Netflix. Attack on Titan is available on Netflix Germany. Caveat I think only the first season is available on Netflix Germany. DVD is another option worth looking into if your daughter wants to watch all the available episodes.
Full answer by Eddie Kal: https://anime.stackexchange.com/a/60807 (CC BY-SA 4.0).
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