I would translate the sentence above like this. メアリーは夜遅く家には帰らないと思います。

I had to translate this sentence in Japanese: I think Mary doesn't go home late at night. But I forgot to write "I think". I kind of translated it but I wasn't sure if it was correct.

The second one sounds right, because the word order of adverbials is jumbled up in the first sentence, which would read as "Mary went back late to home at night" in English. The adverbials expressing the same terms should generally be placed next by next.

日本語に訳すと　”メアリーは夜遅くにうちにかえりません。”　です。　この文章の前の文章はありますか？