Both Riley and Tina below, have valid and workable solutions.
My kids, like Riley's, are big kids and had GINORMOUS appetites even at that age and even during the night.
With my firstborn, my daughter, I was still nursing her... but it was not a lot by this point and she self-weaned at about 2.5 years old.
My son, self-weaned at about 1 year old (then I switched him to a bottle which he took happily), but his ginormous appetite still ensued... and even now at his age, and at growth periods, he needs a 'drink' and will swig an entire 9 ounce sip-cup and then some. Then he konks out again, back to sleep.
So for each child, it is different.
What I did with my eldest child is, though, is I talked about it to her, in a non-threatening way so she didn't get stressed about it. Then, one day she just stopped, cold turkey, all on HER own and her own pacing. She just told me one day "Mommy I don't drink (from you) anymore, I'm a big girl..." and then she giggled like she thought is was so silly that she used to nurse! Then that was it, and she never went back. Oh and like Tina mentioned, I would SHORTEN the nursing sessions... and not just let my daughter hang on for eternity. And she adapted to that. Then I would engage her/distract her to something else.
With my friends, they actually put band-aids on their nipples, and would tell their kids (who were about 2 years old) that Mommy's milk didn't work... or Mommy has a boo-boo. And they said that worked for them.
Sure, I was tired of nursing my daughter at her age... but I truly believed in self-weaning... and my Husband did too. He was actually proud of me that I did so, and would tell all his friends! *eek*. :)
But it stops one day, and it will become a distant memory.
Your daughter does not even nurse much now... but she wakes... but the waking is not necessarily due to "nursing" per say... it is something that would happen anyway, because at this age they are going through so MANY cognitive and even neurological and REM sleep pattern changes... that they don't know how to handle it and well, Mommy's boobs are the thing that comforts them, and her closeness.
So....
Even once my girl self-weaned... she still would wake during the night. She would get afraid of the dark and the noises and what not, or just wake to pee. Its normal. So, just stopping nursing alone, will not be a magical cure-all for night wakings.
Take it one issue at a time. Because, MANY more phases and sleep anomalies WILL occur. Yeehaa! Even teens wake at night and they don't know why. That's the thing, sometimes a child wakes because... and we don't know why. Even I wake during the night... and I'm an adult.
Talk to your daughter about it... and one day she will stop. Your boobs will return. And our bodies will be ours again. :)
My daughter went from my boobs, to having TONS of stuffed animals in her bed... and she called it her 'nest.' And sometimes she'd suck her thumb. She said it soothed her. So... from one thing to the next... we Moms will fathom and experience all of it. My son did the pacifier after having my boobs. It's fine. No biggie. And they are both truly independent kids and so well rounded and confident.
Your girl, will be okay. And your boobs too.
All the best,
Susan