I exclusively fed all three of my children breast milk for 1 year before introducing "solid food", and my son was 9 lbs. 3 oz. with a big appetite. I would definitely say the best thing you could do would be to check out a book called "On Becoming Babywise" and focus on the fact that it is about using a flexible schedule that suits your family and wise guidance from you to get your child on a routine. If you follow the feed, wake, THEN sleep cycle as recommended for your child's age, you will find that once her metabolism establishes a routine, she will begin sleeping through the night--and so will you!!
We have 3 kids, all different temperaments and personalities, but they all three slept through the night by 9-10 weeks of age with NO adverse effects (other than some frustrating times for us parents as we got to know their personalities and when they really needed something and when they just needed to be left alone and allowed to learn to fall asleep on their own, which can mean crying some). There is no such thing as frustration free parenting, but this is a really great tool to get everyone on a comfortable, confident even keel (as even as it can be with kids). It all comes down to at which point in time and how you prefer to go through the "pain" and effort! As the saying goes, anything worth having takes work. (There are tips in the book for what to do when your child needs to fall asleep on their own but is crying and all you want to do is pick them up. They don't advocate torturing your child by letting them cry unecessarily or being cold to them, but there are times that they can be soothed but not picked up. This way they learn to know that when you put them in the crib, it is time to sleep.It will be best in the long run as it also sets the precedent for when they move to a "big bed".) It is a matter of guidance and teaching them the skill of falling asleep on their own, which has the benefit of them sleeping through the night! It will also help your milk supply and energy, since you will be able to rest and produce on a regular routine without constant demand. Also, make sure she is getting a full feeding and not just snacking and wanting to go right back to sleep during the day. The only time you would put them right back to sleep is during the night until that feeding gets dropped.
Hope this helps! Best wishes; it's worth the effort!