Hi R.,
I am 35 y/o mother of 3 girls, ages 3,4,7. Potty trained all my girls by age two. I put a small potty in the bathroom right next to my own toilet and would take them with me each time I would go and multiple times in between. Had a basket of favorite books next to their potty. Also rewarded each of them with something "sweet" they loved. For my first daughter, we kept a large bag of M&M's in the cabinet in the bathroom and she got 2 or 3 pieces each time she was successful in the potty. For my second daughter is was dum dum suckers and my third loved princess fruit snacks. Then we would have "tee tee" or "poo poo" in the potty parade and LOTS OF PRAISE! I have read in many parenting magazines that you shouldn't reward children with candy or food and we don't usually. However, potty training is serious business and it really worked for us! (by the way my children are 50% for size, so the "treats" didn't spoil them).
Briefly tried sticker charts - were not nearly effective as treats!
One last idea also worked for my third daughter (she was the hardest) I just finally put panties on her so that she would feel wet. We changed panties often during the day but she finally got it after 2-3 days.
Good Luck- One thing I have learned is all children are different! You just have to find works for your child! It can be a 2-8 month process! Just be patient, consistent and stick with it!