Looking at the little girl's hair, note that it is being wind-blown from her left hand side.I've come to the conclusion that 'she' must be wearing a head scarf!
If her Mother was wearing a head scarf, of a type which is a see-through 'net mesh' fabric, and she is facing that direction, then it would billow-out with the wind, making it's appearance in the photograph round and helmet-like, with the brighter lit part of it reflecting of the top off of the headscarf making it appear even more helmet-like.
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