I don't think so it's that problematic if you left the cooked quinoa last up to 2 hours if left around. You can easily roast the quinoa, just left it for half hour near gas or heat, once the water is drained you can roast it with little oil. You can also store cooked quinoa too with few...
In vegetarian diet there still a lot of substances which may contain fats. Consuming such food in moderation is beneficial. However, if she's overeating them because it's tasty then of course it will effect her health.
Tofu texture and soft stays up to 3-5 says only if unopened, if you opened and stored in fridge you should have used the air tight container. You used plastic bag which may effected the texture and color of the tofu.
Is your pan flat in the base? If it's not flat, it will never operate with induction. However, if you want you can also use non Induction cookware on Induction cooktop.