"Tok hun nøklene?"

Translation: Did she take the keys?

[cymster]

You can also interpret this as She took the keys?

[OsoGegenHest]

No, "she took the keys" is a statement. "Did she take the keys?" is a question. It's the same in both languages.

[cymster]

Then it's a American intonation slang thing where I'm from. My bad.

[Hrafnunga]

I think he misunderstood you. It's not limited the American English, and it is a correct alternative (with the question mark/intonation). However, it may not always be accepted on Duo, so I tend to stick to standard question order for these sentences.