She didn't look like a boy, on inspection of the genital regions. Maybe she was confused. Is there any possibility a doe could think she was a buck?
I look back at myself and laugh. It's all obvious now. Those books I had been reading were surprisingly outdated; and maybe the author didn't know a single thing about rabbits. Because bucks and does aren't that different.
UPON SEXUAL MATURITY, BUCKS MAY.....
....begin to spray urine. This is disgusting, of course, but can also be caused by boredom and loneliness. Not all bucks will spray. Some are cleaner then others, and some are very, very messy! Usually this completely goes away when your buck is neutered.
UPON SEXUAL MATURITY, DOES MAY.....
....become aggressive, shy, or territorial. Think hormonal "teenager". This varies from doe to doe; I have both kinds of does in my rabbitry. The kind that becomes mean, and the kind that stays forever sweet and docile.
UPON SEXUAL MATURITY, BOTH MAY.....
....scatter their droppings to mark their territory. "Breed" or "hump", each other or objects to show who's the boss. Does "breed" the buck to show that they want to be bred. Be sure to separate your doe and buck around 3-4 months; they can breed and become pregnant at this young.
There you have it. And when I say "sexual maturity", I mean anywhere from the age of 4mos to 6mos, depending on the rabbit and their personality. Most begin this maturity at 5mos old.