Pecked chickens attacking other chicken

[DeepDishChix]

Hi,
We have 3 Easter Eggers, an Amerecauna, and a Gold Sex Link. 2 of the EE's have been getting pecked for around 5 months, but yesterday they decided to gang up on the Gold Star. The GSL is the nicest chicken we have, and has never been attacked before. Are they attacking her because she is a different breed?

 

[teach1rusl]

How old are they all?? They may just be getting to the age where they're redoing the pecking order. Are they making her bleed, or just pecking/chasing a little bit?? They're not cornering her and attacking her???

 

[DeepDishChix]

I've found that every time one of them pecks the other, if I give them a light kick (very light) they don't bother the other chickens. Thanks for your reply!