In dead earnest, she tries to raise hell, put on an act as best as she can, forgetting altogether she still is a greenhorn in such matters, though graduated to be his bride from a lover for so long underprivileged all the while, grabbing the very first chance after the new found privilege.
He watches her goof up inexperience in evidence, out of the corner of his eye does nothing but conceals his smile; caught in the act, her perplexity gives her up, that was the best part of the act: the bride's belligerence.