Yikes! Has this woman read CON and LOTR? They certainly don't encourage the use of magic in everyday life. The everyman of LOTR is the hobbit and humans, and neither perform magic.
The magic in LOTR is different to my mind than in CON, and HP magic is different again. Like I said, in CON, I think the Deep Magic Aslan refers to is mercy and grace -- and it isn't practiced by anyone, it simply is, and Aslan alone can put it into motion.
In LOTR, the magic seems to be an inborn power in Gandalf and the other wizards that is honed over time, but I just see it as a thematic element of the story, not a symbol for any biblical concept. It is used for good by those who are good and evil by those who are evil.
(Come to think of it, in LOTR you could see the magic as spirit power: practiced for good by the angels who serve God and for evil by the angels who have rejected God and become demons -- so in that case, the "magic" itself is neither good nor evil, but demons practice it for evil, and angels practice it for good. Tell this woman that! She is protesting the same story you find in the Bible: the great war in heaven when Satan fell like lightning - Luke 10:18, Revelation 12:7-9.)
The HP magic is different again, but more like the magic in LOTR to my mind, not necessarily a symbol of any biblical theme, but just an intriguing part of the story ... but I could be wrong. We have been discussing HP and whether the magic is evil in HP books, over in another thread.