In ancient India, there were social. classes. people did their work with out complaining to get reincardnated to a higher class.
The untouchable got reincardnated to a higher class because of her good karma. (she is now a Sudra)
are you the new servant?
Yes, mam.
She cleaned the Kshatriyas home, but a jealous person, (a old friend of who she was working for) decided to kill her for revenge. the jealous vaishya snuk in.
the girl is reincardnated again, becoming a vaishtriya.