She will NOT poop in the woods. I will guarantee that. I think I might put some ExLax in her coffee just to see what she does, my guess is she would hike back to the car and poop inside it instead.
Well, you can skip packing in TP... That should save about one ounce worth of weight... JK.
All good suggestions in the other posts. I might add a lightweight hammock to the list. That was my GFs favorite thing on a past camping trip.
I took exactly one camping trip with a girlfriend- one was enough. It was years ago on cumberland island. Two other girls tagged along too... Pretty good trip all around. I think my favorite part was sharing a campsite with a boy scout troop one night... I was the lucky b*stard sharing a tent with three hot girls.... Ah- to be in my mid twenties again.