She never said a word that implied, to me, that she was accepting that he killed the girls. It was all passive voice as before, something that just happened to the them and him. She just toned it down and, IMO got some very good coaching on how to say he was innocent without actually saying he was innocent.
I know others here don't agree with me, but both the parent Watts used, IMO, the words "I forgive you Son", as a code phrase to tell him they still believe his original story. One of the original stories, that is.