The others dance around her and then form a new circle and she becomes the chosen child to start a new cycle.
[3] The first noting of the rhyme/song is by Alice Gomme in 1898 in her book The Traditional Games of England, Scotland, and Ireland.
A child who picked bluebells alone could be spirited away (mastered) by the fairy folk.
This folklore may originate in the poisonous nature of the bluebell bulb which can kill if eaten.
Death was also said to tap his victims on their shoulder as he chose them at random, so there may be an allusion to the plague years.