What is the Catholic Church's view of Anne Catherine Emmerich - can her visions and prophecies be trusted?

What is the Catholic Church's view of Anne Catherine Emmerich - can her visions and prophecies be trusted? Is she a true prophet by the biblical standard? *(This question has been prompted by the comments to the answer to [What did the serpent look like?](https://christianity.stackexchange.com/questions/7632/what-did-the-serpent-look-like/31040#31040)*)