I know Rebecca doesn't read here and pays no attention whatsoever to 15 trolls and dicks but just on the off chance she glances this way take heed....
We all wish Poppy better, no one wants to see her poorly and as parents we understand it's tough. However be smart, know that cancelling your charity run after such pathetic fundraising attempts and using this as the excuse will inevitably back fire massively for you. You have been able to comfortably leave your ill child at home with a parent while you visited the gym today. While you may say this helps anxiety etc it is a non essential visit, that could have been postponed if your child was deemed ill enough. Unless she deteriorates and is admitted to hospital overnight there is ABSOLUTELY NO EXCUSE for you not leaving her with her father again, for similar amount of time, so you can complete the run and raise the money for a charity.
I know you won't do it for the sake of the charity, but for the sake of your business, and your reputation, don't be so arrogant as to cancel.