She looks just like the 5 silver laced cochins that I got this year. I have one that has a much bigger comb than the the rest and I would guess he is a roo. I would guess that yours is a pullet. Mine are also about 10 weeks old. I absolutly love them--they are much nicer than the other chicks I got at the same time.
Here is my SL Cochin ROO!!for comparison, they are about the same age. Hey I think you need a nice Roo for your hen to make a nice pair for you.......?!?! yea I've got what you need LOL