A few weeks is nothing if you've been living in a constant state of paranoia and vigilance. The body becomes used to being on edge and it takes time for it to wind down again, your mind won't follow until then.

[In other words... it's going to take time.]

That's what my healers called it, at least. If it's a new developement I can only see it being one of two reasons. Either something significant has happened to her fairly recently... or she is having a hard time letting herself aclimate to not having to fight anymore. That can also happen. You can become too used to living in a constant state of war...