I can't offer a lot of advice since my older two quit on their own at 8 and 10 months and my two year old would rip at my shirt and try to tear his boo out with a vengance. Only in the last six months has he gotten to the point where he's ok without it, though he still comes to me time to time for a quickie snack. He is fierce in loving the boo and I've got to be careful about not changing in front of him or he'll go after me. He's even worse than my nephew was about wanting it and that child LOVED his boo. Pacifiers, sippy cups, letting him cry it out? HA! I've gone hours with only a brief consolement both at night and at nap to try to get him to give up the boo and it didn't work. Sippy cups and pacifiers only made him angrier.
What has worked for me was allowing him to nurse when he wanted, at first, but to limit the time. If he'd normally nurse for 10 minutes on each side, I'd allow five on each side then cut back a little at a time. It got to the point where a few "sips" on each side made him happy. When he was getting to the point of nursing only for a minute or so on each side, I cut out all nursing except for right before naps and bedtime. Not easy but I would use a lot of distractions and hope he forgot. I started replacing the boo with other things. Like singing a song to him before every nap and bedtime. I always sing Dream A Little Dream and will repeat his favorite part to him. This only works for sleeping though. Routine has helped GREATLY with my son, so giving everyone a kiss goodnight, getting his song, then making sure his animals and whatnot are lined up just right for sleeping. That's become his "pacifier" in one sense.
Saying "bye bye boo" also helped a lot. He understands the finality of it. Now he's to the point where he wants to lay his on my breast and he will try to sneak a sip but at least he's finally sleeping through the night and my breasts are pretty much their own.
Also, finding a two bedroom apartment or giving up your room for her will probably be a HUGE help. Tristan rarely slept through the night when we shared a room, even when I draped a cloth over his crib tent so he couldn't see me. The little bugger KNEW when I was there and no matter how quiet I was, he'd often wake up within 10 minutes of me going to bed. It was something we had to deal with until we bought our house and everyone could have their own room. After we moved, Tristan started sleeping through the night after a few weeks. Not regularly but it did eventually come. So for over two years, I basically had the same sleeping schedule as the mom of a three month old. Up every few hours. If you're tired or tense, babies sense that and then that makes them want to cling to you (or the boo) even more.
Also, being gone and I mean OUT OF THE HOUSE when it's time for your daughter to go to bed might help. If she knows you're in the other room, this will NOT work. At least not for my son. He was no fool. But being gone and letting his dad or brothers lay him down for bed or nap and staying gone for a good half hour after also helped some. Still didn't solve the problem but it helped him to learn to not depend on it and minimized the number of times he came after me in a day.
I used to think that if you want to quit nursing, you just stop and keep the breast away from the child and redirect their tantrums or wait them out but that did NOT work with my son. And I am NOT one of those moms who always gives in. I'm known as the tough mom or the "mean Aunt Angie" as my sis-in-law jokes because I'd lay down the law with all the kids, including hers. Some kids aren't going to take no when it comes to boo and like it or not, it's easier to appease the child than to have a battle with an angry octopus inside your shirt or listen to a screaming child for hours on end who doesn't care about the kind of comfort you're offering if it isn't nursing. Sometimes you've got to pick your battles and find out what's most important to you.
It can be extremely frustrating when you just want your body back but cutting down on the frequency and the allowed time to nurse when she does and then trying to enjoy that special bond that only comes with nursing because soon enough it'll be over. And if she's your only one or your last one, you'll look back and sigh over the tender moments long gone.
Good luck!