I "converted" to Wicca about 5 yrs ago. Born and raised Southern Baptist, but never felt right in any Christian church. i shopped around for a long time and finally gave up. i know i believed in a diety/deities but not in the all powerful vengeful jealous old testament God.
Through several little twists of faith I was invited to a ritual and haven't looked back since.
Sure it might just be a phase inspired by a movie, or she might be using the movie to break the ice on the subject with you. There are several good sites and books out there, and a lot of bad ones too.
IMHO, she is going to look into Wicca whether you like it or not. Wouldn't it be better if you were well informed and offered to help her instead only of trying to get her to look at other options?
There are some groups out there that claim to practice Wicca, but they are really very far from it. I know of at least one group in the Atlanta area claiming to be Wiccan, but it is a sex and drug cult. Nothing they "practice" even remotely resembles Wicca.
This is one of the best basic explanations of Wicca
http://www.ravenwoodchurch.org/beliefs.htm
There are several branches of Wicca. I practice with an eclectic independent coven.
Here are a few sites and books
http://www.witchvox.com/
The best book IMHO for a very simple into into Wicca
http://www.llewellyn.com/bookstore/book.php?pn=L118
Since she is really interested in the nature connection
http://www.llewellyn.com/bookstore/book.php?pn=J181
I will try to find my copy of recommend reading for beginners.