Kids, especially teenagers, say the darndest things. Don't know what the my fault comment was about. Maybe she did accidentally leave the book. Just try to approach your W with it as a general thing. Soemthing like "D14 said this. I'm not quite sure what she meant by that. What do you think?". Try to keep it as neutral as possible and keep the discussion as a "joint parenting" discussion. The more the two of you can compromise and discuss the DD's in a co-parenting manner, I think that things will also begin to smooth out and the two of you can make some progress. I hope that made sense. I'm so tired right now! Have a great evening!
WCB
God grant me the serenity,
to accept the things I cannot change,
To change the things I can,
And the wisdom to know the difference.
- Reinhold Niebuhr