Great advice above, one thing I would add is prepare her for how you may look.
I don't know what you are going in for, but of you are likely to be hooked up to monitors, or machines try and explain them in the first couple of visits.
When I was hospitalized before ds2 was born (5 or 6 days) he visited daily and wanted to see what was around, so we took him on little tours so he knew where I was and could picture different things when talking about it with daddy.
We showed him the machines I was hooked up to, and the midwives ( I was on the maternity ward) often put the ctg on his tummy, or the pulse reader on his finger or listened to his heart - which made him feel comfy and at home there. He was 5 months older than your dd though.