She probably does know and is trying to reel you into some drama. Since it is in regards to your children, you should respond.
Perhaps a simple response:
"I have not, however I did make arrangements to take care of it upon my return."
Me:45 ExW:48 M:04/97 3 Bombs & 2 ReCons 1st BD 11/10 D Finalized 4/20 D-16 S-14 Going in one more round when you don't think you can. That's what makes all the difference in life.~Rocky Balboa