Congratulations on your lovely new baby!!!
Right now, what she is doing is normal. When you can, take her off your breast and get her to sleep in your arms or crib. This constant feeding feeling is due to a couple of things - she is stimulating your supply by feeding, so the more she feeds, the more signals your body gets to make milk. This will help your milk come in. The other thing is that you are comfort, your breast is comforting to her. She is completely new to everything - the brightness, the sounds, the smells are all new. And she's had quite a journey too. So being close to you makes her feel better and safe. You smell and feel like home, because you are home.
I did read something that might help. It was basically that all the smells etc can be unnerving to a babe in that it's all confusing. Might be worth asking visitors to hold off on the smellies and impose a no perfume etc rule - so you are cutting down on the smells. Reason being, you are helping your DD to smell you. I did this with DS (also held off on letting too many people hold him etc for the same reason).
A few bits of info here for you:
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http://babywhispererforums.com/index.php?topic=64627.0 *
http://www.kellymom.com/bf/normal/newborn-nursing.html - see the first week for some reassurance "you can't feed too often"
Anything comes up, anything you're unsure of or if you just want some support, just let us know okay?
Charlotte