runts?

I'm a first time chicken owner and I got 7 just hatched chicks on Thursday and plan to keep 3-4 and give the rest to a neighbor (who has chickens, wants a few new pullets). One of the barred rocks is a lot smaller than the others and I've watched her carefully to see what could be wrong. I checked to see if she was pasted, I tried seperating her a bit from the others (still within the brooder) and put down lots of feed on paper towels so she could eat as much as she wanted - but she jumped over the divider to get back with her sisters. She does eat and drink and doesn't seem to be picked on or chased away from food - she's just smaller (and not quite as healthy looking) as the others. I know a real chicken farmer would cull this little chick, right? But I'm only keeping 3-4, and my neighbor will only be getting 3 or 4, so is there anything wrong with keeping a runt as a pet? Will other chickens start to bully her? Might she have a growth spurt and catch up? If I kept her as one of 3, would she still lay eggs and would she have a better life than if she was one of many chickens in a bigger and more established flock? Finally, how do you actually euthenize a chicken if that is what you decide to do?

 

whew - thank you, that is exactly what I hoped to hear!!