Actually Sanam IS educated:
1. The way she spoke yesterday...but most of us might think Sanam was actually mocking Nida, giving a reply in English the way Nida spoke.
2. She had called someone asking about the job interview ie, she read english newspapers having job vacancies.
3. She read ENGLISH recipes.
4. She used the internet searching for recipes.
If you're talking about her command over the language, it's hindi. Because even after all that she's read at school, her environment couldn't let her practice speaking English; She ran a dhaba...what do you expect from the people who went there? She took orders in Hindi, not as a posh French waitress. She served the people and wanted to equalize they're status with hers...I mean c'mon, no matter how high the literacy rate is, Its not that all "educated" people speak only english.
My POV!