"These girls aren't cheap labour, they're people." - challenging Mr B's views and opinions about work ethics.
Sheila challenges Mrs B as she is the social superior [towards the end] as she disregards her responsibility to Eva - implies a sense that upper class people hold high level of immorality compared to working class
Sheila also highlights the inequality between how women were treated depending on their class.
E.G. SHEILA = Spoilt and privileged, Whereas, EVA = uncared for, exploited
PERSONAL RESPONSIBILITY:
Sheila accepts that she was wrong almost immediately and accepts responsibility - Illustrates her morality and socialism.
Priestley emphasises her sense of guilt by using repetition of pronoun "I" and short telegraphic sentences - indicating her certainty.
Sheila is the most sympathetic character in the allegorical play - she teaches the audience the importance in taking responsibility.
LOVE & MARRIAGE:
Sheila views love and marriage as faithful, loyal and romantic.
For example, the play begins with celebrations of Sheila's & Gerald's engagement.
STAGE DIRECTIONS> 'The lighting was "warm" and "intimate"'
this emphasises that it is a joyous occasion - initially deep in love.