I recently cut off my long hair for summer. It used to be past my chest but it was severely damaged to the point where it was breaking off. To give myself a new start, I cut it to a shoulder grazing style. It's similar to this haircut in the front and about two inches shorter in the back:
That's nowhere near too short. I actually however prefer super short hair on a girl, so although I think that's a pretty haircut, I like even shorter than that on a woman. For example, this girl's hairstyle looks really sexy to me.