Maybe something like "I know people will cheer up from just getting some candy" or "I can be so sure that people will cheer up just from getting a piece of candy." - because it's probably supposed to be a double-edged reference. When she says it, she means herself but she's also doing the Chechov's gun by pretty clearly implying it's her plan to use it (and then she does).
Anyway, thank you very much for your hard work.