Pygmalion Part 2

Towards the end of the story, Eliza tells Higgins that she can't stand him. So why has she put up with him thiswhole time to become a lady? Was it really worth it? She became a "duchess" just to marry Freddy and have no money. It doesn't really make sense to me. Then the story ends without anyone speaking. It is told like a normal story, so I must bring up the performance aspect of this play again. How do they tell this part of the story? Do they have a narrator or a chorus like in Shakespeare plays? That would make sense but the written version never references a chorus like Shakespeare plays do.
Next, this story hardly has anything to do with Clara, Freddy's sister, so why do they give us a long spat about her in the end. They tell us about how she's poor and can't get married. How in any way does this connect to phonetics and Elizas training? That's what the story was really about. How this poor girl who can barely talk becomes a poor lady that is able to find a husband. And even though she said she can't stand him, why does Eliza continue to consult Higgins after she's married? Seems as though she'd be happy to have someone else and she'd block him out from the rest of her life.
One last thing that interested me was how there were also narrations throughout the book and not just at the end. Are these actual narrations or stage directions? For example, "Eliza tries to control herself and feel indifferent as she rises and walks across to the hearth to switch off the lights. By the time she gets there she is on the point of screaming. She sits down in Higgins's chair and holds on hard to the arms. Finally she gives way and flings herself furiously on the floor raging." I can see where this is a stage direction and this is telling the actress what to do such as going to turn off the lights and sitting in the chair. However I can also see this as a narration explaining to the audience what is going on because it would be hard to demonstrate, "holding on hard to the arms." The audience could be confused when she sits in the chair for a little bit and then suddenly flings herself to the floor.