What does Eliza do after hearing Higgins' and Pickering's comments? Why does she react this way?

Higgins returns, looking for his slippers again, and Eliza throws them at him. Eliza angrily explains that she does not know what to do with herself, now that she has won the bet. Higgins says that she is overreacting. Actually Eliza isn't overreacting. She is reacting the way she should have a long time ago. Eliza is offended at being a pawn in a wager between two rich men. She is a human being worthy to be more than part of a condescending experiment between two entitled pompous old men.