Is your dog spayed?
Your dog is likely in heat.
During the estrus (heat) cycle, the vulva becomes very swollen. And since she's just at the right age for her first heat cycle to begin, I'd be willing to bet my last dollar that's what she has going on.
Yes. Dogs generally begin bleeding about a week or so into their heat cycle. You may not even notice that she's bleeding, as some dogs are incredibly good about cleaning themselves.