For what purpose does Ms. Brinklow ask Chang to lend her a book? (Chapter Six)

Brinklow asked Chang is she could borrow a book about the language. She wished to study the language in order that she might someday see her society send a missionary to Shangri-La.

“Exactly,” she answered with a touch of fierceness. She added: “Anyhow, I don’t see why I shouldn’t make a beginning by studying the language. Can you lend me a book about it, Mr. Chang?”