Sheila and Eric both show their responsibility for Eva smith's death towards the end and Sheila shows support for socialism towards the end. Sheila is a feminine symbol throughout the play when subverts patriarchal norms and ignores her mother and her words of how she should be when she uses slang-terms which is unreputable and hands her engagement ring back to Gerald without hesitation. She also stops her father from involving when she speaks. I would also typically focus on Sheila's change throughout the play. Sheila and Eric are Younger generation Vs Older generation, focus on that too.Good Luck!