Does she have any kind of comforter you can give her, i work in a 2-3 room in a nursery and i know that these can be a hard age to settle. At our nursery we encourage parents to bring any kind of comforter, this can be anything from cars/planes/dolls/muslin/dummies, e.t.c each child has their own draw and peg once said toy is dropped and forgotten about we put in/on there.
Can you give her a muslin that smells of you, or let her choose something she can take to nursery.
How vocal is she, it is important to explain that mummy is going to work and dd is going to nursery but mummy will always come back, parent who say that they are going to the toliet, or just popping to the car, and then leave for the day can be very confusing for the child and then the child can become unwilling to be left for many more weeks.
Make sure when you leave, you have a set morning routine and then leave, don't drag it out, its so not let her think that you may be staying. e.g at my nursery we have a self registration board, children come in take their coats off, maybe go to the toliet, (if potty trained) sign themselves in, and then go to play or i take them off the parent.
Can you take her to any kind of creche, play centre, let her get use to being with other people, other children, in a sense let her learn 'the rules of the playground'
Does she spend anytime with any other relations?
You could talk about all the fun things that she can do at nursery, e.g large scale painting, a climbing frame, sand play, the homecorner??
hth