I am a fan of Fight Club, does it show?
Basically, Tilly has been on some homeopathic stuff to help her detox from the phenomenal amounts of sugar she'd been putting away since sometime before Easter to help her cope with the sleep deprivation that our son brings with him. Turns out that one of the side-effects, when it hits a certain level within the body, is to increase the hormonal imbalances in the brain that cause intense emotions - ergo Tilly got all worked up and emotional with no real reason.
Enjoy Jonah's party.
Interesting facts: 25 months; 8 days; 22 months; 1 hour; 11 months and counting. Did I mention self-serving?