My three bio girls were all 3 months short of their third birthdays before they were really trained. I stressed with the first one. After that - I cared a lot less.
I agree whole-heartedly w/SAK9645, though. Expectations and peer pressure do a lot more than Mom barking. When your daughter does't want Suzy sniffing that she's a "baby" - she'll dry up in a hurry. Make sure she's around kids that are trained and she'll want to fit in. Even at this age - they are who their friends are.
I also found character underwear helped. My eldest didn't want to wet Barney.
I've had four in kindergarten and I've never seen one start in diapers.
Becky
The Woodworth Family in Beautiful San Antonio TX