anyone notice this in "the queen is dead"?

when the blue fairy (cora) gave young snow the candle, she told snow to keep it a secret but right after she told her mother not to mention the other people in the room probably heard her too like the doctor and nurse and johanna. but when snow and david and mother superior were trying to get gold's dagger, snow told her that she kept her secret. was snow lying or was that a writing error? it occurs to me that young snow isnt big on keeping secrets i.e. revealing regina's true love to cora.