I don't think she looked all the great when she smiled--perhaps this is why in formal portraits and events she is unsmiling. In more natural surroundings, she gave way to her native personality without regard to how to photographed best. Just speculation on my part though.

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Helen appeared rarely actually smiling in portraits or official photographs. But that was more in my opinion, rules and codes of photography at the time, rather than any state of mind on her part - shyness, reserve or other -.
Indeed, most of the official portraits of the time imposed on their models a mine was serious, grave, and a dignified, solemn and stiff, rarely allowing them to smile, or an unobtrusive way. The more relaxed and intimate portraits as those of Marcus Adams were exceptions. Even those of the renowned Cecil Beaton, who was inspired more artists of past centuries as avant-garde, rarely smiling.