I think its limping nutrition, your daughter has developed despite of having poor nutrition.My daughter is a vegan two A* and an A at a levels very good university place. My wife is a vegetarian and she worked as a Vet for 25 years and now does my agronomy. Me I love meat I drive a tractor.
I did not eat meat for over 30+ years, but my children did. In studies done with already malnourished children, you would not deliberately make a control group of malnourished children, the improvement in developement is considerable when given animal protein. There are plenty of studies available that show this.