Yes, because she is not related to the occasion.
Fred was there because he is Nikolai's god father, so he was there again when Nik was confirmed. It was the immediate family from both sides. Parents, Step-parents, Grandparents, Godparents.
I haven't been to one so I don't know the protocol

, I always thought that those occasions were open to all the family (even to the wife of your godparent).