Keep a super close eye on that girl, and pull the nanners when you see them. You'll still miss one or two, and may find some beans, but not enough to ruin your buds. Likely herm genetics if you haven't interrupted the light cycle or caused other stress on her. If you have mold under control, misting the male flower areas with water will render the pollen sterile. I'd be careful about overdoing it late in flower, though, as it's an invitation for spores to "germinate'.. I like to spray immediately as the lights come on, so there is time for the water to evaporate during 'lights on'. Just be careful not to leave large drops on the leaves; they act like magnifying glasses and will burn your foilage.