Aren wizards, psychics and other magic-users automatically Satanic?
You must be referring to that old “Thou shalt not suffer a witch to live” text in the Bible, or something like it. Well, ultimately, this is all make-believe. If you sat a Satanist down and asked her to explain how she does curses and casts evil spells, it would be nothing at all like what happens in role-playing games. Magic in RPGs has more to do with super-hero powers than with Satanic rituals. If you are concerned, tell your child that you don’t want her to play a magic-using character and leave it at that.