S.L.
Just let her know you love her and that the baby is loved too and don't try to over do the attention to her. I would let her help you with the baby by bringing diapers and telling her how much you need her help and how wonderful it is that she is a big sister and things like that. Of course that is true but the more she helps and sees her role as a big sister who is still loved and needed the better she will be. I would still give her alone time when the baby sleeps, read to her then, etc. and then let her know the baby has to take time too. It will work out before too long at all. Some times it was hard for me too, the mom, to adjust to my baby being the older one.