Just let it finish naturally. You only have one plant so you don't have to worry about it getting to your other girls. The weed will still smoke just as nice, it'll just be like a mex swag bag, full of beans, which you should put down the garbage disposal. No matter what others say, the hermie trait is bad.
If you had other girls in there I would recommend destroying it, but with only one you might as well let it finish. When you harvest, be sure to give the grow area a good scrubbing down, including all the equipment, buckets, walls, floor, everything. Use 2 parts water, 1 part white vinegar. This will make the pollen left in the room non-viable and leave everything shiny and clean. Just spray and wipe.
The next issue is to identify why your plant hermied. What conditons occurred that we would call "stressful" but that the hermie gene sees as optimal to assert itself. Did you have severe nute burn, temps to low or too high, lack of ventilation? Be Capt. Hindsight and think about what could have caused this, and be sure to correct that issue in your next grow.
