Why were you asking if she was prepared? Set times/days for pick up and drop offs and be done with it. My "take" on the interaction is that you sounded pretty condescending and **assumed** she wasn't going to make sure the girls had lunch tomorrow. I would have blown up if someone spoke to me like that.
My advice, set a schedule and stick to the responsibilities. You may be intending to "help" but it comes off as treating her like a child.
Me: 35 husband:39 Sons 16 and 11 from my first marriage Twins 5 (boy/girl) Daughter 3 Affair bomb 2/27/14 He moved in with ow 3/13/14 OW kicked him out 6/15/14 4/2016 he seeks help for sexual addiction