Hello. Congrats on the new pregnancy!

The way you describe you DD is exactly the way my son was. I thought I was never going to get him away from it. He was 18 months at the time, He always wanted to nurse, and also co slept with us and would do the same thing throughout the night, latch on and comfort nurse. I talked to his doctor and he gave me a suggestion, I was a bit skeptical and first and thought it seemed a little mean, but I have to say it worked and he has no lasting effect from it. lol He is now almost 6 years old.
The doc told me to get some kind of mild hot sauce, or something that taste really sour even and put a little on my nipple, you could even try putting something on your nipple, that you know your baby doesn't like to eat. This way when baby latches on it taste horrible and they decide they dont want it. I always had a cup of water of milk handy to give after he quickly pulled away. the first couple of days was difficult cause he would cry a little about it, out of frustration. The point of it is to make them not want it cause it taste bad, that way the child is giving it up, you are not taking it away from them.
It took a total of about 4 days to get him to give it up. I then went for close to a week and didn't give it to him at all, and he didn't ask for it either. He still was co sleeping for the most part, but he starting sleeping all night, and on the bichance he would wake up fussing I would give him a sippy cup with water, and this helped.
After about a week I started getting encorged a bit, from him stopping, so I offered it to him at night, if he happened to wake up. Then maybe once during the day when he went down for a nap. I did this for maybe a week, then I just stopped giving it to him altogether, and there was no fight whatsoever.
So there is what I did, and it worked like a charm. Oh and about a month later I started putting him in his own bed, and he started sleeping there on is own. when I put him down for a nap or at night, I would sit next to him till he fell asleep. I kept his bed in our room for a while so he knew I was right there still. He slept all night for the most part, every now and again he would wake up and want to get into bed with me, but not every night. He now sleeps in his own room with no issues.