Quote 1
MRS. PEARCE. Yes, sir. Then might I ask you not to come down to breakfast in your dressing-gown, or at any rate not to use it as a napkin to the extent you do, sir. And if you would be so good as not to eat everything off the same plate, and to remember not to put the porridge saucepan out of your hand on the clean tablecloth, it would be a better example to the girl. You know you nearly choked yourself with a fishbone in the jam only last week. (2.188)
Mrs. Pearce has strong views on the potential harmfulness of what might be called bad behavior. As she sees it, Higgins must look and act respectable if he expects Eliza to change for the better.
Quote 2
MRS. PEARCE [patiently] I think you'd better let me speak to the girl properly in private. I don't know that I can take charge of her or consent to the arrangement at all. Of course I know you don't mean her any harm; but when you get what you call interested in people's accents, you never think or care what may happen to them or you. Come with me, Eliza. (2.152)
On the other hand, Mrs. Pearce suggests that, under certain circumstances, Higgins's manipulation is inadvertent, and that he is even capable of losing control, of manipulating himself.