Maybe people do have this mystery substance but they keep it in their sheds or garages?It's just another way for Lucy to feel so speshul and younique, no other parent in the country would have this mystery substance in their house . But it's not relevant what it was....
Logically, it must be whatever base chemicals used to vape eliquid? Not illegal but not something everyone has in their homes? She doesn’t want to say and have it connected to Riot Squad/ Riot Labs?
It’s a pretty extreme way for the universe to tell Lucy to be a bit more humble about the golden daughter though.
I thought long and hard how to phrase it and I’m still not sure I captured the total irony of the only child who Lucy seems to care about being hurt and her extreme hubris about having an OMGDAUGHTER.I wanted to type this but you've but it far better (and with more politeness) than I could have.