Quote 7
Eliza. You see, really and truly, apart from the things anyone can pick up (the dressing and the proper way of speaking, and so on), the difference between a lady and a flower girl is not how she behaves, but how she's treated. I shall always be a flower girl to Professor Higgins, because he always treats me as a flower girl, and always will; but I know I can be a lady to you, because you always treat me as a lady, and always will. (5.143)
Ironically, Eliza argues that the man who taught her to be a lady will never see her or treat her as one. She also suggests that transformation is subjective, that not all people will acknowledge all changes.
Quote 8
THE FLOWER GIRL [springing up terrified] I ain't done nothing wrong by speaking to the gentleman. I've a right to sell flowers if I keep off the kerb. [Hysterically] I'm a respectable girl: so help me, I never spoke to him except to ask him to buy a flower off me […] They'll take away my character and drive me on the streets for speaking to gentlemen. They— (1.59)
Eliza seems extremely insecure about her own identity and character. She fears that even the smallest offense will lead people to look at her and treat her differently.
Quote 9
LIZA. I ain't got no mother. Her that turned me out was my sixth stepmother. But I done without them. And I'm a good girl, I am. (2.118)
Eliza seems to have grown up without a feminine presence in her life, and she's proud to have turned out all right anyway. Perhaps this pride is what leads her to keep claiming she's a "good girl."