Why did the servant in pearl refuse to speak old language chapter one?

You are likely referring to the novel "The Pearl" by John Steinbeck. In the book, the servant, Kino's wife Juana, does not refuse to speak the old language in Chapter One. There is no mention of any old language or of Juana refusing to speak it.

Perhaps you're thinking of a different part of the novel or a different character altogether. Could you please provide more context or clarify your question?