[Margaery would kill it again and again if she thought she could, but she feels helpless. and she hates feeling helpless]

Ugh. What a wretched creature. [she shakes her head in disgust.

she looks up at the change in his tone]

...I see. In a way, it makes it worse. I just [she throws her hands up] happened to be there. At least with Cersei, I knew the reasons behind her deeds. And I cannot trust it to not try again since it was so easy the first time.

My Elven friends have placed wards around my apartment and the Sewing Shop. The creature should not be able to pass them.