good points, Sky; but I will say that even though the practice of witchcraft/Wicca is shown in a very fantastical way most of the time on Buffy, there are also a lot of details that are quite realistic, and the recent story line in which Willow gets addicted to magic is an interesting metaphor for drug addiction and, to some extent, the psychological damage that can be done by "dabbling" in the occult for purposes of exerting power over others, etc.

The vast majority of witches do not belong to covens, so the suggestion that they seek solace there is unfortunately not a very useful one. Human beings need to be able to create effective support systems to help them and this poor child did not have a strong enough one, apparently.