tactfully point out that there are plenty of unhealthy people who eat her diet as well and for whatever reason, the newspapers choose not to report those!
We've all been there and had the same pointed out to us all of the time. I even saw a nutritionalist at one point when I became seriously ill. It was a Swedish friend who suggested it and she couldn't make any changes to my diet after everything. I consulted her again when I decided to quit to rat race and go off and cycle around the world. The outcome as that she tactfully pointed out to me that where I was able to source ingredients and cook my own food (not always possible and there were one or two occasions where I ended up eating meat/fish because of the countries I was in and the availability of food resources full stop) I was better off staying vegan because it was a healthier diet and included more protein than returning to being vegetarian or actually trying to eat meat/fish on a regular basis.
I did notice a couple of other thread titles from yourself - relating to junk food and to being pregnant, so you may possibly want to consult someone over a vegan diet so that you are getting enough protein vits and minerals from your vegan diet because resorting to junk food and the likes (frozen ready meals) is often a good indication of someone needing extra support in learning to cook vegan food from scratch. (but if I have the wrong member, I apologise).