It sounds like we’re dealing with a mix of issues here - knee pain, overweight, and that B12 and you mentioned the collagen tablets. Let’s take this step by step and see how Ayurveda can lend a hand.
First, the knee pain itself. From an Ayurvedic point of view, it’s essential to consider what’s aggravating the Vata dosha since it’s often linked with pain and joint issues. A couple of things might help here. A daily warm oil massage - specifically with Mahanarayan oil or sesame oil - can be very beneficial. Just warm it up a little bit and gently massage around her knees. This not only helps in reducing pain but also increases flexibility.
Diet plays a part too. Since she’s vegetarian, ensure her meals are nutrition-rich but easy to digest. Warm, cooked foods are ideal, maybe a light soup or kichari, ensuring they’re anti-inflammatory. Incorporating turmeric in her diet can naturally reduce inflammation. But don’t overdo it, just a bit daily should suffice. Avoid cold, raw and carb-heavy foods that’d increase Kapha and might contribute to that feeling of heavyness.
Now exercise, or mobility rather. Encourage her to take small, gentle walks once she is able after warming up, like after massages. This helps improve blood circulation n bring some strength to the joint area without overstraining it. She might also find some relief from soaking her knees in warm water with a handful of Epsom salts, now and then.
And about the B12 deficiency, for vegetarian choices; dairy products, fortified cereals or maybe a B12 supplement as allopathy is equally important.
Remember, Ayurvedic interventions are complimentary for chronic conditions alongside medical guidance. Keep checking with her primary healthcare provider and if her pain gets unbearable don’t hesitate to follow their advice promptly.