What is Eliza speaking of when she says, "we were above that at the corner of tottenham court road?

Higgins mentions that his mother can find a man for few. Eliza tells Higgins that she is opting out of his take on society. She would rather be acknowledged as a lower social class girl (fellow flower girl) for they have a clearer sense of morality than the "ladies"; they don't need to be sold into marriage.