Who is Beilke from Tevye the Dairyman and the Railroad Stories and what is their importance?

Beilke is Tevye's youngest daughter. She takes care of Tevye after the death of Golde. Beilke agrees to marry Podhotzur who is chosen for her by the matchmaker. Beilke has difficulty adjusting to the lies and pretenses of Podhotzur the contractor, who is wealthy. Later, Podhotzur goes broke and Beilke and her husband flee to America where they work in sweatshops.