Best of luck to you both. Make sure to check in about her objectives for the day to see if they're the same as yours. If her objective is to primarily spend some quality time with you and secondarily to hunt, then make sure it's relaxed & you spend most of the time hanging out, talking, etc. Be ready to see deer walk away or not even show themselves. The hunt is becomes nothing more than the excuse to be together.
But if she's bent on getting a deer or at least giving it a solid hunt and, secondarily, do it with you, then you can get more serious about the day.
If your objectives aren't the same as hers, you're itchin' for trouble. So make sure to check in with her.