J.H.
I know this won't be what you want to hear, but I would just get rid of diapers and go straight to underwear--cold turkey. I bet if you put her in underwear full time, she'll get the idea. My daughter was about 2 years 3 months when she potty trained fully, but we started getting her interested when she was about 19 months. We got a little potty, put it in the bathroom, and let her try it when she wanted. She would go sometimes, and not others. She was in a diaper this whole time. After the initial excitement of the potty wore off, she chose to go less and less often, and finally, I noticed there was actually dust on her potty! That, combined with the fact that I was about to have our second child, made me try to get her interested again. I tried bribing (marshmellows) and making sure I asked her to try every hour or so. She still was only about half interested. But I never pushed the issue. Then my son was born, and I came home from the hospital with this tiny baby, in teeny tiny diapers, and the first time I had to change my 2 year old's giant poopy diaper, that was it! The next day, LITERALLY, I put her in underwear, and within three days, she was totally trained (during the day). She would have stayed in diapers much longer if I had let her. SHe was never one to care if she was wet or poopy. The other thing that helped us was getting a seat that went on the big potty, rather than making her use the little one on the floor. She liked using the grown up potty better. Good luck. It will happen! You have quite a while before kindergarten!