I think the best thing you can do is include her in everything you can, that's what we did each time and we never had any of the jealousy issues or anything like that. Like for diaper changes they would help by bringing me stuff, or I'd let them take one of the tabs off so they felt like they were actually helping change them. We told them all the time what great big brothers they were, so helpful and all that. During feeding times..I didn't tandem so I'm not sure exactly how it will work if it's the same time, if her seeing the baby will make her want to nurse all the time but during feedings I would read to them, or they would get to watch a special show or something like that. I tried to put in an extra effort with them when I wasn't doing stuff for the baby too, like making special food...just cutting their sandwiches into cool shapes or something to them it was great, and really it was just an easy way to make them feel like I had done something special you know? I tried to include them as much as I could with anything, baths, playtime, diapers, packing the bag to go out.