d'ulcce chick with a squeaky chirp?

[ChickSter99]

I have a pair of 8 week old d'uccle chicks and the female, Gracie, has a squeaky or horse chirp. The roo is just learning to crow so of course that is the only time he really has a squeaky voice. But other than that, Gracie's everyday chirp is squeaky and horse almost scratchy sounding. Is this normal for this breed of bird?
Helps if I spell it right. Sorry.

 

[ChickSter99]

Hello? Would anyone know if this is normal for this breed? If something is wrong with her I want to know so I can help her. If not, then I can stop worrying.