My third daughter was almost 3 before she potty trained too. Just because they are head smart, doesn't mean their body is getting the right message from the brain to the correct muscles!! Be patient, and whenever she shows interest, give it a try. Try incentives like stickers, candy, whatever special treats she likes, and you can give out freely:) If she doesn't go, don't get upset, just say 'okay, good girl, you tried, we'll try again later', and leave it at that. I know it's hard to remain calm, but the more frustrated you get, the more frustrated she'll get too. I tried the padded underwear, but they were too messy. Finally I just put her in real panties, let her wet herself a couple times, and she got the hang of it real quick! She had trouble with constipation too, and we finally got a Rx for Miralax from our ped. and it did wonders. She wasnt' night trained until she was a couple months past her 3rd b-day, but now she's dry every night!! Just try to relax, she'll get it soon, and never look back:)
C. G.