If she is open to everything, try fresh and real before canned (fish) or processed (lentil pasta),
Try making meatballs in tomato sauce, meatloaf, crumbled chicken, even saltimbocca. Any meat that remains, soft , saucy and tasty.
For the fish, boiled cod is easy, put in water frozen when it floats it is ready, just melt some butter, mix some fresh parsley and a crack of pepper. In France, sole is the main fish given to children. Stupidly easy to cook, have the fishmonger remove the skin (or do it yourself), butter in a pan, 4 minutes on each sides. done.
Try clams or even mussels if you live on a coastal area.
IF she likes beans, embrace legumes. Chickpeas and lentils and why not tofu, but for the tofu remember, it is a blank canvas, so the difference between a blank canvas and the Mona Lisa is what was put on it. Make this sauce 2tbl soy sauce, 2tbl olive oil, 2 tbl nutritional yeast , mix, great for hard tofu (never buy soft or silk tofu), dry tofu with paper towels squeezing water out, cut into cubes and either eat raw with a bit of sauce on top or cover ed in sauce and baked in oven .
More than quorn I would look at quinoa for a toddler. For the potatoes, have you tried the cold potato salad, mashed potatoes with the center filled with a rich veggies sauce