Does blood go to your vagina when you get horny?

Nope. That's only in the male. His penis gets engorged with blood and that's how an erection happens. The only blood rush females have is in the breasts. Our nipples get hard and vaginal secretions go wild.

In females, there is a blood that rushes in to fill the clitoris and hood. It is a relatively small amount. The clitoris and hood get engorged with blood to make it stand out. It feels a lot like a big pimple. The amount of blood is considerably less than what fills a penis though.