X-pen if you plan on using one
Pee pads if you plan on training on these pads in lieu of going outdoors
If you plan to teach her to go outdoors, perhaps you would want to use doorbells so she can tell you when she wants out: poochiebells.com
Crate if you plan on using one (I never have used them)
Puppy bed with warm fuzzy baby blankets
Non-plastic water bowl and non-plastic feeding dishes (plastic can cause contact dermatitis on the nose and result in white spots)
Toys: Small stuffed toys/squeaky balls and other squeaky toys/chew toys
Neutra-Cal - available from your vet - in case of hypoglycemic episodes
Perhaps baby gates so you can keep her in a couple of rooms with you when she isn't in the pen
When she arrives you will want to have food and treats on hand after you learn from her breeder what particular food she has been fed.
Warm sweaters/sweatshirts/coats and probably jammies, too.
Lots of love and patience...