If she agrees to go with you make her as comfy as possible (warm clothes, hand & foot warmers, hot drinks) etc. If she likes photography, it may give her another "focus" besides just sitting there, being quiet. I don't hunt with a weapon YET, but do take the camera and have a good time relaxing in the outdoors.
If she doesn't want to go at all there really isn't anything much you can do, except to assure her that you will spend equal (or more) time with her and then do it!
Good luck to you both. It may take a while before she agrees, so give her some time to think it over.