Why does Madame Sylvie have a conversation with Pearce in Book 2, Chapter XVIII?

Madame Sylvie has a conversation with Pearce the morning after the incident with Jane in the pond. She tells him that she noticed that Byron started to run when Jane disrobed, but he did not. She does not accuse him of anything improper, but he should have known to cover his eyes. He asks her to pay attention to the girl--not as a suitor. She wants him to give her practice of what it is like to interact socially with a man. Pearce agrees.