I do use a protein powder mde from hemp. Because we, as a culture, tend to underestimate the amount of protein we get, I am really on top of what protein my kids get.
Look online for the amount appropriate for your child's age and really research foods. There are lots of food with protein in them.
I usually add it to a smoothie and really research the manufacturer of these powders. I agree that a lot of them are made in china and are probably full of JUNK and dangerous chemicals, metals, etc.
I wouldn't avoid protein powders like some have suggested. As long as you are informed you will be fine.
My doctor said NO, but when pushed admitted that it is their response because parents tend to overuse protein, but that if done in an educated and informed way, they can be used appropriately. I'd avoid those instant drinks...number one, I have never seen any organic ones and they have fillers.
Make a yummy smoothie with organic fruits and veggies (make sure it ends up a pretty color) and add some protein powder and/or yogurt or milk...although if you can get the yogurt and milk in your child, you may not need the protein.
I also add it to my son's oatmeal and fruit breakfast and put a bit in our homemade waffles and pancakes.
I've noticed a difference after meals that are low in protein, so I do try to sneak it in to my son's food.
But take a good long look at what she's getting over the course of a day rather than at one meal.
Good luck!