Teachers are not fools, and are of course likely to discover this "secret", unless the child takes careful deceptive measures to ease her mother's worry. This five-year-old could, for example, conform to the class norm by pretending that she can't read, pretend not to know the answers to questions, pretend to struggle with new learning, hold back from classroom discussion, and so on. But what a strain on a small child.
Of itself, honesty is neither boasting nor pushing, and it is the easier and more positive route.
PROFESSOR JOAN FREEMAN 21 Montagu Square London W1