What, if any, camping gear do you have? Find out about her experience and what gear she has.
I'm guessing you must be car camping. What are your plans for meals? Jump in the car and go to a diner for breakfast? What's on the itinerary for the trip? Day hiking? Lounging by the car and reading?
You can rent tents and some other gear. I would guess you could rent a propane camp stove, and probably a lantern. You'll need pots, coffee mugs and dining gear if you'll be cooking. You'll want a sleeping bag rated down to at least 20-30 degrees. A sleeping pad (maybe rent one, too). A day pack for day hiking. A 1 liter water bottle for each of you. A little battery powered LED headlamp is extraordinarily valuable, and you should both have one. Even if you'll be eating in restaurants, you'll want a cooler for fruit, snacks and drinks.
If you can build fires and there's firewood available, you may want to have a small camp axe and you want to have a lighter or two. If car camping and you have the room, there's no real limit to the amenities. Folding chairs, boom box, beer, wine (don't forget the corkscrew), etc., etc.