Emma caught Charlie with a piece of chocolate after she'd raided Emma's 'secret' stash.
It's sad actually, as this is the point in time when the game turns into a tense, unforgiving family drama. The close and warm relationship between mother and daughter is suddenly destroyed by a last betrayal and warped into a tense, uncomfortable cold war due to this devastating action by Charlie. Even with the MC's help, there are no longer any grounds for a reconciliation, no possibility of forgiveness or absolution.
Who's side will he chose, who will he stand by in the Loyd Chocolate War, or will he walk away and abandon both to their tragic fates?