If you know the nursery theme, another great idea is to get a nursery accessory
. You can be sure that she will like it if it matches the nursery. There are plenty of inexpensive yet great gifts items such as a picture frames and lampshades or larger items such as a mobile or an extra set of sheets.
The crib bedding itself is a very personal choice so I wouldn't suggest giving that, but you could certainly add to the nursery theme.
Most new moms set up gift registries so it shouldn't be too hard to see what she needs. You are safe when buying from the gift registry because you are buying something that she has chosen.
No matter what, it is always extra special to receive an unexpected gift that someone else picked out, just for you.