She wonders at his curiosity—and what it is he thinks he may offer her, if his line of reasoning matches hers. There is no moral judgment in her speculation. If he has an interest in her service, then let him make an offer on it.

"If they do not pay me, then I have no obligation to them. I am no one's slave. If someone else makes an offer in the meantime... as I said, there is no obligation without payment."