How do all you fellow women cyclists wear your hair? Short? Long? Medium?
Where was the option for freakishly long? Mine is down to my ankles, very thick, coarse and wavy.

Ponytails, braids, clips?
If I have an extra 15 minutes in the morning I'll put my hair into a single low braid. However, the braid is still too long to let hang loose. If I have a jersey with a back pocket I'll stuff the braid into the pocket. Or, I'll put one or two Viking style knots in to shorten the braid up.

Usually, though, I'm in a hurry so I make a hasty loose bun at the nape that hangs low enough to not interfere with a helmet. It looks like this.

Damage from helmets?
I always use a Buff under my helmet. It prevents damage to wispies, absorbs sweat, and keeps things tidy. Also, having multiple buffs so I can use a clean one every other day helps reduce helmet-induced acne since it's much faster to just don a new buff than to wash the helmet foam pads that touch my forehead.