Hi Dziner. Is she getting out of her big girl bed or is she just calling for you? If she is getting out you could try the silent return. I think it's in the Weissbluth book, basically returning child to the bed without talking, smiling, etc. You might have to do it over and over again (like for an hour or more!), but I've heard that it works pretty well. We still have Grainne in her crib so I haven't had to deal w/bad bedtimes.
What happens if you don't go back in? I think you have to come up w/some system, like okay you can have one more book and then that's it, or something. I think she is probably too young for the sticker/progress chart thing.