You can freeze, thaw in fridge overnight, then slice and reheat each serving or the whole dish, might be helpful to put in a tin foil type casserole size tray as it’s thin and will thaw and reheat in a more timely manner, or go from freezer to oven if you choose, it’ll just take longer to bake if fully frozen.

Yes, you could substitute any alternative milk for dairy milk. You can also add some veggies like broccoli, spinach, or make it with ground turkey or cooked chicken like a rotisserie. Hope she likes it!

Yes, of course you can. And I’m sure it would be yummy. Add about a cup, you can mix and egg and some salt pepper and oregano into the mixture for delicious flavor.