We can't demand her to trust us, or to not feel threatened by us. Not when she's just arrived and we don't know what point in the series she comes from. We don't know what she's dealt with yet. All we can do is try to make her feel safe, and make sure she knows there's someone here that can help her if she needs it.
Awww ye.
[ You may do a victory dance, Mr. Stilinski. ]
Which means he probably should.