I don't know much about the series, but I've found a
wiki. I'll try to break the magic it lists like they did.
Earth Witch - Probably a Nature-based Sponsored Magic. It seems to be heavy on thaumaturgy and less on evocation.
Ley Line Witch - I'd add Evocation, maybe with a limitation that it will only work near a leyline. Depending on the universe (which I know nothing about) that could be a minor or major limitation, giving a bonus anywhere from +1 to +2.
Demon Magic - The description screams of a Demonic Curse based Sponsored Magic with an Evothaum towards curses.
Seems she would have a high Stealth and Contacts. Maybe even a Stunt that has to do with Planning although I'm only basing that off of the wiki.