Hi there,
I would say that since she is so very young, it's probably safest and best to not try to alter her sleep-feeding schedule yet. Those first 6 months are very hard, I really feel for you and how exhausted you must feel. However, your baby is following her biological imperative in waking you up frequently at night. Believe it or not, your body actually produces the richest and most growth-encouraging milk at night (between 1 - 5AM!!), which is why babies instinctively wake during those hours to nurse. It's dreadfully hard on mothers, but it makes for healthy babies.
At around 6 months, when many babies start trying out solids, the sleep-feeding start to really improve and you can start actively working on having her sleep for longer stretches at night (even through the night). But for now, while she is still an infant, I would not risk tampering too much with her schedule. That being said, there are a few things that you can do to get more sleep.
1) Nap when baby naps. Forget about household chores; Mommy needs rest, too. If you have any friends or family or a nice teenage neighbor, try to arrange for someone to come over and do a load of laundry or wash some dishes while you nap. This will help SO MUCH.
2) Have your partner help with night feedings. When baby wakes in the night for a feeding, your partner gets her, changes her if needed, and brings her over to you in bed, so you can doze a bit while she feeds. Either of you can put her back to sleep.
3) Co-sleeping. If baby is in a co-sleeper crib attached to your bed, or even in bed with you, this will make night-feedings easier and more restful, so that everyone can get back to sleep more quickly.
Good luck, you are on the right track!