She's afraid of us, and to fix that, we need her to understand that we aren't a threat and that other people aren't going to harm her. I don't know where that fear started or how, but it doesn't matter. What matters is finding a way for her to face it.
Even though I suspect she would've been scared of me the most{Talking about Doma}, she's most afraid of Merida and keeping her distance. I can see that she can't take her eyes away from her. She's actively avoiding even circulating her mana around while we're close.
Now that I'm thinking about it, Merida is really unhinged for a human. I've never seen one who can kill like that, with no hesitation, no bloodlust, and no remorse.
Lucia is their Alchemy teacher, guess why?