Iron Witch (The Iron Witch Trilogy)

The Iron Witch  - Karen Mahoney Donna hides her arms under gloves to hide the iron and silver tattoos that gave her back the use of those arms after a faerie creature damaged them when she was young. The same incident where her father died. Her mother is suffering from a mysterious ailment that resembles a mental illness and she lives with her aunt. Her best friend is Navin who brings her to a party which leads to her meeting with Xan, who it turns out is part-fey. When faerie kidnap Navin, it's up to her to save him. What she does will have large implications in her life.