She looks like a chicken to me, too.
It's no problem to cross breed different breeds of a species, like chickens or dogs. Different breeds of chickens are all the same species, they're chickens. Different breeds of dogs are still dogs. It's an entirely different thing to breed two different species together. Like a dog and a wolf, a horse and a donkey, a tiger and a lion. Chickens and guineas are different species. Depending on which species you are breeding together, their offspring may or may not be sterile.
It's no problem to cross breed different breeds of a species, like chickens or dogs. Different breeds of chickens are all the same species, they're chickens. Different breeds of dogs are still dogs. It's an entirely different thing to breed two different species together. Like a dog and a wolf, a horse and a donkey, a tiger and a lion. Chickens and guineas are different species. Depending on which species you are breeding together, their offspring may or may not be sterile.