"The cat is behind her."
Translation:Die Katze ist hinter ihr.
I am curious. "Hinter" is a two-way preposition, so the noun that follows should be either accusative or dative, depending on whether one is expressing movement. So would would be an example of a sentence that uses "hinter sie"?
Perhaps "Er geht hinter sie." The movement requiring the accusative case. But that is a guess on my part, based on what i have learned in this module. (MHalRZ)
This implies the same meaning, but the Duolingo sentence specifically says "is" instead of "stands". Your sentence says "The cat STANDS behind her". This would be comprehended the same way, but it's just the verb that Duolingo asked for that matters here. Hope this helped!