I watched the video... now I'm confused...
Oh dear... Well, as I said, I'll think of her as "probably female." Other than the crowing (which she hasn't done again since I recorded that as far as I know), she hasn't done anything necessarily rooster-y.
1234ro, I haven't had many Sebrights but if they have noticeable combs at 4 weeks (and you have others that don't), I'm thinking they're male. As I've heard quite often over the past few days, the thing to look for is a spike pointing backwards. If you look at pictures of sebright roosters (there must be tons on this thread) you'll see what I mean.
Edit: You asked what a rooster looks like, I can give you what a less-than-3-months-old cockerel looks like:
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