"She is at school."

Translation: Dia ada di sekolah.

[ZahraAurelia]

You don't always have to use "ada," you can also just say "dia di sekolah." It's the same thing. You should know that, Duolingo.

[DiegoJaviUnlam]

Hai! Many sentences in the course can be accepted with "ada" and "berada", those verbs are lacking in the most of sentences. So, I think the contributors already know "that". Please, try helping with the course reporting your sentence.

Selamat belajar! :)

[Gujjar9295]

This sentence can be, "Ia ada di sekolah."

[WaterIce455]

I think it's will be more correct if you use Dia instead of Ia

[A_Revaldy]

Yes, commonly we're using Dia rather Ia, but Ia is acceptable CMIIW