Try Linda Sonna's books on potty training... she has sections on early training and knows a number of different methods, so you can pick and choose one that fits your daughter's pace. There are very valuable and detailed ideas for trouble-shooting.
I would have your daughter practice pulling pants/panties up and down even she doesn't need to go (does she have a doll she could dress?). Also, when I shopped for my son I looked for outfits that he could easily get into and out of himself--pants with elastic waists, underwear that was a couple sizes too big, no more overalls, no belts, that kind of thing. Of course, in the summer little girls can wear dresses (though for their dignity I always thought a little pair of bloomers underneath was most appropriate, as little persons are often hanging upside down).
I expect it will be some time before she can go all by herself. My son is 4 and still likes company when he pees. He likes to comment on how much he has produced. Sigh. Men.