"여자아이가 학교에 늦게 가요."
Translation:The girl goes to school late.
That's incorrect. The question uses 늦게 (an adverb meaning "in a late manner") to describe the verb 가요. In your sentence "late" is an adjective describing the noun "girl". For your sentence the Korean equivalent would need to place 늦는 before the noun instead of 늦게 before the verb. I suggest reviewing the tips and notes for the Modifiers 1 and Adverbs 2 skills accessible from the mobile/desktop website (not the mobile app unfortunately).