My daughter played flute in her high school band and in the municipal band during high school and after graduation. Once she started in college she let it go. Now she's involved with LARPing and wants to play some early and traditional music. She'll use her concert band flute but would like to have a wooden flute.

I know nothing about flutes but want to give her one for a graduation present. Are there any suggested sources, suggestions for finding a used one, or any knowledge you would care to share?

I also need to find books of Irish or Celtic music for flute.

The limit of my knowledge: I THINK the wooden flutes come in specific keys. What would be the best key for playing Irish or Celtic music.