Could be that she just wanted the closeness. First night at home is so different to hospital and been close to you she can hear your breathing and feel your warmth. Once she gets use to the home environment she might settle better.

Both my DD's ended up with dummies at about 5 days old. Once my milk came in the wind troubles started and I found they wanted to suck to help themselves relax and then they would get rid of the wind easier. Giving them the dummy saved my nipples.

I would also suggest if you are not already. Keep on top of treating your nipples. Lansinoh (sp?) is great for rubbing on after every feed or even just some breastmilk too. That way you wont get to pianful if the cluster feeding keeps up.