Yeah, the "bitch" seemed a bit out of place, like what would be written in for the movie version of the book b/c it would get the audience going "Oh shit! Oh shiiiiiit yeah!"

But also I felt uneasy about how the only time we see Mrs. Weasley kicking butt is in defense of her child. What the hell was she doing during the rest of the battle? Can we see some more of her power coming out, please?