Well, you certainly don't want her eating it. Though it wouldn't kill her, you'd want to issue some firm "NO!'s". I'm sure youngsters on farms have walked through chicken poop for centuries, probably eaten some (ick) and lived.
Now, you didn't say if your chicks would include a male. If you end up with a rooster, you cannot allow small children around a free range rooster, even one that is normally friendly. Kids make quick, jerky movements and lots of noise and make roosters defensive and nervous. They can react suddenly and a small child is the right height to lose an eye. Only takes one flog to do that. Even my super sweet marshmallow of a rooster is visibly nervous when he hears kids screaming and playing at the neighbors, even though he cannot see them.
X2!! I don't have children, but there are plenty of neighbors that do- and since we live on a dirt road, a lot of times, the kids will play "in the road". My flock runs free range, and I don't have a fence all the way up to keep them in my acre, so whenever I know kids will be out playing, I keep my flock penned up because I don't want to risk the kids getting hurt. It's impossible for me to watch my flock's every move, so I'd rather just play 100% safe and just pen them up. Both of my roos are docile, but they have some nice sized spurs that could take eyes out in seconds!
