I think just keep doing what you are doing. It sounds like she's getting the right idea, you are on the right track! :)
If you are going to make any changes, maybe get pull-ups. They are alot easier to get on and off, especially with a toddler standing by a toilet. Our DD always tries to put her own pull-up on, it's pretty cute. And I think the pull-ups let them feel when they have gone a little more than a regular diaper.
But I am no expert, we are actually at about the same spot as you, it sounds like. But my plan is just to keep letting our DD figure it out, since she seems to be doing that anyway. And just encouraging her, we put her on the potty throughout the day and give her a sticker every time she uses it. The last couple of days, she's been sick, so we haven't had much success, but I think once she's feeling better, we will get right back on track.