So D13 just texted me that W hasn't come to my house to pick them up yet. I trust my D13 can watch her sisters for a few hours, but should I contact W and tell her that I don't feel that is acceptable or should I just let it go?
How long ago was she supposed to pick them up? Give it some time before you jump to conclusions (she could have a valid reason, hard to believe as it is). Maybe just tell D13 to give you a text when she gets there and then give yourself 24-48 hours before saying anything to her about it. Would refraining (For now) be a 180 for you?