HI,

It really IS very tiring in the early days. Generally babies will feed 8-12 times in 24hours. Can you tell us how many wet and dirty nappies she is having in 24hours? Had her weight checked since she came home?
Does she have one breast or both? And how long IS she on each breast for? Sometimes it can be worth feeding them for 20 mins or so from one breast (it's not a precise art!) and then give them time to have a burp, a nappy change and offer them the other side. The overnight pattern sounds good!