My dad speaks 11 languages. I speak just one. You and I jumped to different conclusions about the girl and her mother than each other. I guess there is no way to prove either of us is right.
In any case competent maids and fruit growers are not to be sneezed at. You are right if the girl does not become proficient in English her future will be very limited. But more and more that is true of people who are not bi-lingual.