[Chito]

To be honest, watching movies in Japanese would be of little benefit to someone who's only taken one-year of Japanese. The odds of them understanding anything more than a fraction of the dialogue are pretty slim.

If you really want to help her out, you might consider buying some simple books for her to read. Manga would be a good choice and she probably already has some on hand considering she enjoys anime. You are right to be worried about her solely watching anime/reading manga, though. The language used in most anime/manga is extremely informal and unlikely to be useful or appropriate in a classroom setting. As such, you might want to also get some Japanese children's books.

Your daughter probably can't read many kanji yet, but she should have mastered hiragana and katakana by now. You can purchase books intended for Japanese children that are written entirely in hiragana/katakana. These are a good way to learn vocabulary and grammar structures that will be encountered on a regular basis in a Japanese classroom setting. The trick is finding books that your daughter would want to read. I don't know much about her, but I can imagine a teen being reluctant to read kid's books. You probably know what topics she might be interested in, though. I personally like to read folk tales and there are many Japanese kids books about those. Just find a type of book she might like and make sure that they don't have too many kanji.