Yet another coincidence miss random - i am 5 10 and my hubby is 6 2. I take a size 6 shoes, but I have been this size since I was 12. I can't remember if I had big feet as a child though. My boys take a 1 and a 13 at almost 7 and 5 and three quarters. So I think the wee one won't need flippers if she is swimming! My hubby takes a 12/13. You might find that she levels out later, or get her signed up as a future supermodel with that height. Don't know if the charts are different for girls, but my boys have a height expectation of between 6 4 and 6 7 which will probably be the same for William. I don't have a girls book , to check if the tables are the same. There is a woman who's eldest daughter is in the class above Craig and she is realy tall, but her youngest is not 4 yet and is nearly as tall as my younger son - who is joint tallest in his P1 class - yet the woman is probably only about 5 4 - I have never seen her husband though so he may be a giant.
I wouldn't worry too much about your daughters feet, she will probably level out - but I do find that they grow more over the summer than at any other time! If she goes up a size a year and stops about 12/13, then that will work out about a 7 or 8 which is probably pretty average for someone of about our height or taller. You will just have to stop feeding her so well!!