these things are worrying, but you can't predict what will happen.
you can choose between being anal - writing lists and preparing like a maniac if that makes you feel better (but know that once you are there you are not in control...) or you can prepare reasonably and let the chips fall where they may
yes, she'll be rattled, but it doesn't matter, she'll cope, she'll be safe and you worrying about her won't change a thing!
you'll pick it up where you left it after baby's born!
I have only one tip for you - when baby's born and it's time for her to see you, do this:
arrange the reunion in a way that she can see you and cuddle and kiss you first, share a treat (ice cream or cake or whatever), sit her on your lap or near you and have a chat about her day and how much you missed each other. fuss over her, she'll appreciate the attention!
she will have missed you, might not give a damn about baby, so don't be upset about that!
once she's settled with you or if baby makes a noise introduce them to each other, let her hold baby with your help etc - and there will be the beginning of a beautiful friendship!
you could give her a little present from baby as well, nice touch
also when visitors come it would be great if they could make a fuss about her first, not baby (sorry), most kids get jealous because suddenly they feel ignored - cue crazy aunt rushing past her and cooing over baby , while older child thins "and what about me?"