So here's a few tips about veganism
(1) if someone tells you your ill-health is caused by vitamin deficiency therefore you MUST restore meat to your diet, this is a LIE. I personally don't believe any health professional would say such a thing. Converting takes time and instantly cutting out all animal products is too dramatic. So consider reintroducing some dairy into your food, even just temporarily. Organic free-range eggs are pretty guilt-Free particularly as a short-term remedial measure. Any free-range chicken will tell you she'd much rather you eat her eggs than bits of her dead friend. Don't listen to negative people who tell you eggs are " living beings" they aren't. When Moses led the children of Israel into the wilderness they were forbidden meat, but God sent quails to provide eggs.
(2) If you have a teenager who has developed reverence for the sanctity of life, you need to encourage her and help her even if it is not possible to share her belief yourself. It's an attractive, life-affirming responsible mind-set. So in order to protect the well-being of your beloved child you need to participate in her perception, help her learn cuisine, take trouble to provide meals that are nutritious and satisfy her beliefs. You need to insure that she doesn't rush things and that she (and you) are properly informed about healthy food. Again I think it's practicable to go through an intermediate vegetarian stage before going to the full commitment.
(3)There is much scaremongering about vitamin deficiency, particularly B vitamins. In fact the vegetable kingdom is particularly rich in the B vitamin complex. The so-called symptoms of "B12 deficiency" are the same as any B vitamin problem so be sure to have plenty of cooked vegetables such as beetroot, cauliflower, and sprouts with every meal. Magnesium is also easy to come by
(4) what vegetarian diets do require unfortunately, is that most meals have to be self-prepared. Processed foods and ready meals don't often retain the vitamin content of the ingredients. Obviously this can be hard if you are still at home and you can't do all your cooking and shopping. Be patient with the mater and pater. They can't help being how they are and hostile confrontations are just going to make it harder
(5) All the best, keep it up, but make compromises and take it easy