I believe the main problem is that what appears to be her primary mask is deceptive, which is bad. When I go to work I put on my town guard's cap, but I don't pretend to be something I'm not. A healthy person has a number of masks to switch between (for example, Yona has a mask for being "wife of the shaman" and a different one as "daughter of the chieftan", neither of which are deceptive at all), but Rae collects them rather explicitly for the purpose of deception which wards people off when they find out.
She could still be a good person, but a great deal of trust has been lost, and the ruins of what was there will slow rebuilding.