Ok... i read a little about the campaing and now i have time to write a concept 
i will try to add points that could lead to some hooks (some more likely than others, but hey, i'm trying xD)
Name and house: Alba ex Merinita
Short history:
She grew far away from humans, in the black forest, with her mother, a dryad (hook: blood related or not?) who guards the forest and (maybe) a portal to a faerie world* that it contains (hook: which type of rego? something big or small?). Her childhood was hard, since her mother knew little about raising a human, but since she was resilient and many fairies helped them from time to time (wood-wives mainly, but they also had a lot of other types of visitors), she grew having an interesting early life (hook: she recognizes some faerie that travels near Tugurium).
One day, a man with weird clothes came and, after talking with her mother, he took her away (ofc it was a magus, but... hook: he found her by chance or did he have some previous pact with the dryad? it was her father or unrelated?).
He brough her to a covenant and after some deliberation, an old magus took her as his apprentice (hook: where it went the first magus?). He lived (lives, he is alive xD) in a laboratory inside the forest but at the same time not too far from the covenant (he has a focus on herbs, which he uses in his potions). For her it was a difficult way to enter into the human world, but surely less hard than going to live directly inside a covenant for sure.
From there onward, it's just a regular master / apprentice relation with heavy difficulties to understand the human ways**.
Concept:
A specialist in Herbam maga with a strong faerie background. She would have some serious issues understanding the world and humans (think of her as a blank canvas... if she becomes worse or better as a person it could be related to her interactions with others, especially her fellow magi).
At the start her priority would be find a safe place for herself (she will see her lab more like a home than her workplace, so you can expect that she gives a lot of relevance to aesthetics and wellbeing). After that... who knows? Herbam is very flexible, so she could be helpful in general (i read about a Gardener role... she is the one for it xD) and since she wants to feel included and learn, it would be very proactive towards helping her sodals (for the best... and sometimes for the worst too xD).
As for what stories might work with her... she's an all-terrain character (not as "she's the most efficient" way, but in "the role-play can be fun" way). It works for a simple dinner with some philosophy talk, or to (awkwardly) help the villagers, or repairing/beautify the covenant, or whatever.
*) Since many dryads are related to one type of tree, i think that the one that would make the more sense is the hawthorn (they were said to be magical trees related to faeries, with some of them even being gates to the fairy kingdom).
**) I will stop here since my spider sense is tingling to tell me that this early concept is going for too long already xD
