You definately want to spay her as soon as possible. Each time she experiences heat, she increases her risk of uterine, breast and cervical cancer (I believe I covered all the cancers heat increases)

Not only that, now she is attracting every intact male within a MILE. Yes, intact males can smell females in heat for a mile, and they will do whatever they can to get to her. Do NOT leave her outside unattended. Even if you've got a 6' tall fence, determined males will get to her. I've heard of males breeding a with female through crate wires!

My girls were always spayed at 6 months. It is a major surgery, but when they are younger, they recover so much quicker.