We tied our calves with them facing the aisle, barn had stalls on both sides of aisle, between us moving around, dogs in and out of the barn, tractor going through aisle, they got used to just about everything.
We were also lucky to have younger neighbor kids who would come to the fence every day to talk to the calves and feed them a little volunteer oats and barley growing along the fence line, calves ran to the fence when they saw the kids.
If it is a little one that is going to show her, then she needs to be the one to feed and water her, you may have to do the tying and handling for awhile but if the animal starts associating the small person with the food, she'll get to where she is happy to see her. If it is not a little one showing then to get her used to them by having her feed bucket near the fence and and smaller children just sit there and talk to her while she eats.
It is just like bringing a green calf home they have to learn that each new thing is not there to eat them. I think there are a few things that get them with kids, they match the size of most predators more than an adult, most cattle have been handled by adults and have grown used to their presents, plus smaller kids seem to move a little quicker them us old folks.