It seems like there are 2 sides. One that thinks feeding chickens raw eggs is bad for them and that it will encourage egg-eating habits. And the other side that normally feeds raw eggs to their chickens with no ill side effects and egg eating habits have never happened. I think there is some truth to both sides. Personally, I'm on the latter. Every time I check the eggs, I'll give my chickens a few raw eggs because perhaps the outside of the shell is way too dirty or maybe I just have too many. Your pullets will be ok. But your friend still should have double-checked with you before they did that lol. But that is NOT good that she taught them how to crack the eggs open! No no no!
Raw eggs are actually good for them. in the 5 years that I have fed my chickens raw eggs, they have not started egg-eating habits. Well, I thought that they did, but it was a false alarm because they were just squashing the eggs due to the scarcity of nesting material in the nesting boxes. That was my fault lol.