Read on to find out just two of the reasons why it pays to read the labels yourself, rather than take your friend's word...
Halloween: What most people call Halloween, because it is the eve before All Hallow's Day in the Christian calendar, is also known as Samhain. There's plenty of debate around about the church (yet again) taking an existing festival and adapting it. In this case turning one celebrating the end of autumn and the start of the darkest months, where the supernatural world was close by, into a time where wandering souls and those in purgatory could be helped along by saying prayers etc.
Samhain is the older festival, and now celebrated by pagans etc as a key point in their yearly calendar of festivals. As for exactly what used to be celebrated, how it was celebrated, and how that compares to modern day Samhain and the whole western caboodle of Halloween?... massive can of worms.
Book of Shadows: Kept by a coven as a group, to teach from and add to, or by an individual to record spells and results etc. According to good old wikipedia "Gerald Gardner, the "father of Wicca", first introduced the Book of Shadows to people that he had initiated into the craft through his Bricket Wood coven in the 1950s. He claimed that it was a personal cookbook of spells that have worked for the owner; they could copy from his own book and add or remove material as they saw fit. He said that the practice of Witches keeping such a book was ancient, and was practised by the Witch-cult throughout history. According to tradition, Gardner claimed, the book was burned after a person died, so that it would not be discovered that they had been a witch." So as most wiitches would know, a Book of Shadows is only as 'evil, shadowy and dark' as the person using it chooses to make it. And for genuine witches the rule of do no harm is a prime one, so the Book of Shadows would be correspondingly free of harm.
Whatever she does believe in, and however she carries that out, I wish her well with it. I only hope that she learns enough to not spread too many broad, detrimental cliches with it.