Blood Red - Mercedes Lackey - Bog

Little Red Riding Hood's real name is Gretchen Schwarzwald, and ten years ago, she was orphaned by an evil Earth Master. She was rescued by a Fire Master, and taught how to use her own Fire Powers. Now a werewolf pack is ravaging Exmoor, and she has come to help London's White Lodge eradicate it and find and destroy the Elemental Master behind it.