Having nursed 4 kids, and gone back to work, I'll throw my thoughts out into the ring, and you can toss them back. I always wanted to "get my kids" ready for someone else, but it never worked. However, within a day or two at daycare, they began to adjust just fine. It is very different when there are no other options and when that source of comfort isn't there.
You could bring a small favorite stuffed animal or something into your arms so it is there when you nurse her to sleep, and maybe she'll associate the toy with the comfort she gets nursing her way to sleep. It might also begin to smell like mom, and when someone else puts her to sleep, she may gain some comfort from smelling her toy, and hugging it, because it's already part of the process.
I was never able to give my kids a bottle, even a bottle of breastmilk because "I was mom" and they weren't fooled. They wanted to nurse for real.
The other thing is: be prepared for the reality of daycare for your child. That's not to make it sound horrible. It is just a transition. We had an absolutely awesome daycare home for our last two, and I particularly remember when child #3 went for her first day. We picked her up, and our "extra parent" said, "well, we survived day one. I'd forgotten that day one for an infant means they cry all day. But don't worry. It WILL get better." By Day 3, the routine begant to work more smoothly It's just a transition, and the little ones don't have choices, and only have their voices to complain with -- and they do. But stick it out. They adjust, and they end up having a great time with the other kids. There's so much more to watch with other children around than at home !
I found that no matter what I tried to do at home to "be prepared" it didn't really work, so I usually gave up, and simply let the chips fall where they fell. And that worked, cuz there were no other options ! (sounds stupid, doesn't it? But I do think kids are more ready to adapt when Mom isn't there and the nipple option just isn't available.)
Good luck. It's hard on Mom for a few days, and you'll remember it, but your child won't ! :-) But be prepared to do a whole lot of nursing and holding when you get home !!
b