Sounds like you are in the same boat we were. Our daughter turned three last July and still had absolutely no interest in using the potty. We had tried to start a few months before her birthday and had to back off cause she actually got pretty angry when we tried to make her sit on the potty. We didn't want it to be a horrible experience for her. She would run around with poop in her pants all day if we let her...she just didn't care either.
But we were actually frantic and desperate to get her into panties cause she is so tall that she was about to outgrow even the largest pull-ups. I was afraid we were going to have to start using Depends. :)
We tried everything. Schedules...kitchen timers...rewarding her with stickers...showing her potty training videos...buying her potty training dolls...having her wear panties all day (and cleaning up nasty messes all over the house)...letting her go pick out her own special panties...telling her Santa didn't come to little girls that wore diapers...
Yes - come November she still wasn't potty trained...so we're talking almost 7 months of trying - and still nothing.
The story I had heard most often from parents is simply "they're ready when they are ready...one day it will click". That just one day such-and-such happened and their child never wore diapers again. "We told her she couldn't have a sleepover until she wore panties." "Some older boys were laughing at him one day and called him a baby and he came back in the house and said he didn't want to wear diapers any more."
I'm not really sure what it was that finally motivated Sadie, but suddenly Thanksgiving weekend she magically started going potty on her own without us asking or forcing and went to bed that night with panties on. Have only had a couple accidents since.
It's not like your child is going to be still be in high school with diapers on. She will figure it out in her own due time. Wish there was a magic answer...but patience and encouragement is really all you can do.