The Insects survive the winter line implies she gave the kids the 'resurrection' drug and is entrusting Maomao to revive them after this all blows over. Of course she's not planning on living herself or else she would revive them herself afterwards so she grabbed Maomao to do it for her.
She used poison on the children, but the task MaoMao was given was to figure out the resurrection drug. It's a longshot, but maybe...Zicui is counting on MaoMao to have solved the riddle.