Why does her daddy have to be a soldier??? Let's point out to her how brave and wonderful he is!!! This isn't unfair, this is something for her to take pride in. He is defending the right to be free and live the lives we are living. He is defending our country and our rights. Tell her daily what a brave and wonderful thing he is doing.
I am sure there are things she can do better than the boys can. Have her ask if them if they can "change a doll diaper better" than she can. Color a picture as well as she can, etc. There are things girls do better than boys do. Have her tell them she can and show them if she needs to. I don't care what it is, set a table, balance on one foot and hop across the driveway, braid some strings to make a rope or a bracelet, tie her shoes quicker, whatever it is.
As for mean children, I finally got my grandson out of it by the following process and this is just a few examples:
"You are fat and ugly", "Okay, then don't look at me. I can lose the weight. At least I don't say ugly things like you do to make someone feel bad," and he walks away whistling or humming.
"You are stupid," "I can learn," and he walks away.
Taking away toys etc., "Okay, so you don't want to play with me anymore and that's all right, I don't want to play with you either," and go get a different puzzle, toy, whatever.
Children are mean to each other, and frankly the children of today are much meaner than they were when I was growing up. I don't know why. I guess because we weren't taught winning was everything, team work got things done quicker and better, and material possessions weren't as important. Watching your friend win was almost as good as winning yourself back then.
Tell her from me I think she is a wonderful person and has a beautiful heart. I am proud of her daddy and the sacrific he is making to keep me, my daughter, and my grandson safe and free. Tell him if he ever sees my son Sean over there to let him know we love and miss him too. If he sees Nathan over there to let him know Aunt P. is missing him almost as much as his mother and his four children are.
I will pray for you and your daughter.