My mother is a diabetic too. And I liked that doctor. Indeed people with this diagnosis always have vitamine deficiency. But my lord, Russian? How can she explain to him what she wants?
Yes, I think she must start learning English soon, even though she is a grandmother already. I also think I know the place where they can help her. She just need to call them at pharmacy sydney https://kennedyspharmacy.com.au/ and they will give her a Russian-speaking pharmacist. My neighbours were discussing it yesterday and I asked them for a link for you.