Diapers are an amazing gift, especially in the larger sizes. My kids grew out of newborn right away, so I really appreciated all of the larger sizes that I was gifted.
I'm not sure when her baby is due, but I had a Memorial Day baby and loved the Muslin swaddle blankets for the sticky summer months we get in New Hampshire. They are a little pricey if you buy them (like I did...in boy patterns even though I had a girl...I was desperate!) but you can make them cuter for less.