Can you please give me advice on working on enacting a monologue from Six Characters in Search of an Author?

[Padmini]

I am working on the Stepdaughter's fountain monologue, talking to the baby, from Six Characters in Search of an Author from scratch. Could you please give me an overview of what the monologue entails, themes, emotions, subtext, and the character and nature of the Stepdaughter? Also, I know that this is a metatheatrical play so I was wondering how to enact metatheatricality?