Hmmm sounds like someone was in character early in the day. (As a WITCH.)
UGH.
No, she obviously does NOT 'get it.'
Not even a little-- or she'd know/realize that this is one of about the three most incredibly, awfully, HORRIBLY stressful days of the entire freaking YEAR for a FA parent.
Don't let a person with a pathological big mouth and a complete lack of compassion ruin your day-- or your DD's enjoyment of being a child first and an FA child a distant second.
Next time she brings it up-- point out that your child is DONATING the collected candy...
and then follow through. Places that would love to have our rejected bagged ToT candy--
women's/children's shelters, homeless shelters, your local emergency food pantry, local first responders, children's units in local hospitals, hospice facilities, etc. etc. etc.