You have answered your own questions. You have an incredibly devoted and attention seeking dog. Give her more attention than you have before (or your newborn at this time) and she will become much less jealous. Let her know she is still special to youWe send her to doggy day care everyday and she is pretty much out and about whilst there in fields/on walks and always comes back tired.
We have reduced it since to 3 days a week. She is very territorial with her toys and I made the mistake of putting the baby on a tummy mat then squeaked one of the toys on it, sure to say the dog barked its head off in the baby face as if to say that's mine.
She has been fine for the last 2 weeks though but you still get the odd side eye when she gets uncomfortable. I don't doubt as baby gets older she will be fine, its just initially making sure we are doing what we can to make her comfortable.