She "didn't want [her] granddaughter exposed to witchcraft." She was certain that "the young lady" wasn't "doing a spell" but it was still "witchcraft."
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Me thinks the lady is paranoid about witchcraft.

I see nothing wrong with that. I have studied a wide variety of pagan faiths over the last 6 years. I practised Ceremonial Magick about 30 years ago.

Now for safety sake; I would personally recommend against using the candle because some children become very excited, and I would hate for a child to knock over the candle and burn them with the flame, or scald them with the melted wax.

Two Bears