A Sudden Change
When Kyler went home that day, Francesca noticed that something has changed. Kyler, who use to fill her ears with stories about what happened in daycare was unusually silent. He retreated in a corner and stayed that way.
Source: Soolide
At first, she did not put much thought into it, thinking that maybe he was just spent out by the activities they did in daycare. So, when she found her note, later on, she was blown away by the unexpected cruelty that happened earlier that day.