With regard to silence it doesn't say wives in the chapter. (It's implied I suppose when it says they should learn from their husbands). Though it would make some sense that single women (for instance deacons) might be acceptable. This is true in historical context as well. I don't beleive head covering is lmited to wives however.
But Paul later says a woman's hair is her covering. Is this not acceptable?
Incidentally, there were women prophetesses in Scripture. I'm sure you already knew that, but I threw that out there for the discussion.