She definitely sounds congested...
I cannot believe that she didn't double check and say to Chris I'm booking Marbella, leaving next Thursday is that alright with you workwise? Not waiting for him to cop it, even just to make sure there was someone to mind the kids. The smug smile after saying she told him she was looking at restaurants because it was this coming Thursday I mean for duck sake, it's not like you're a roommate skipping out when the rent is due, you're a grown woman with responsibilities. She needs her safety net pulled from under her. The child's first full week of school, most parents would do something nice on the Friday or even just be there to talk about it but ah no, not grace. She'll just pack her rolling stones t-shirt and pyjama shorts into a case and plod off to Marbella.
Also the smug shade at Jen "Jen did 5.30am classes everyday for a year so... Anything is possible .."
I think I'd be telling her I'm not idle fodder for you to babble about into your phone at stupid o clock while shirking your responsibilities. Thick.