Hope someone can help me w/ my RIR

[pluma3]

I'm a little afraid that she might be a rooster, compare to my other chicks she is so much bigger then them. My 3 chicks are different breeds so I can't compare, they're 7 weeks old. Here's a few pictures of my Rosebud.

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[Chickenman76]

Looks rooish, but do you have better pics?