hi there - ignore everyone and listen to your head and your DD! (if I actually meant that then i wouldn't be able to go on and post advice cos then you would have to ignore me too!)
My MIL was nag, nag, nagging me to get my twins into pants, I got the "all my three were dry by the time they were two" line....so i tried, i really did, but i got fed up of getting to 10am on a saturday morning havnig mopped the floors twice, gone through all the changes of clothes and never being able to go out....so i gave up - then one weekend it was my birthday, and she came up and yes they were in nappies again, so she commented (again), so i snapped. I said "listen it's my fooking birthday, i wanna relax, i am not chasing them round all day with potties and changes of clothes"..."oh it's not that bad, if you just put em in pants they'd soon learn"....so I said, "fine, they going in pants and YOU can deal with it".....5 hours later, she flopped back into the patio chair with a glass of rose and said "yes i think you're right, they're not ready!"
Oh it was such a sense of achievement, proving that ALL kids are different, all family dynamics are different (i work full time, i only see the twins properly at the weekend, so didn't wanna spend it stuck in doors constantly asking if they wanted to wee).....
So now for my advice. When they WERE ready (now 2.11 btw and dry). Set aside a weekend when you don't mind stopping in. Stick heating on and leave DD in t-shirt and pants, no trousers or skirts. Leave potty where she can see it, get lots of spare knickers so you not going up and down stairs. Then go for it. I actually stopped asking my two if they wanted to go, and they started going un prompted. (we also bought a step for the big loo as they seemed to have the nack for stand up weeing, not applicable in your case!). During this time, of course you are going to need to go out somewhere just to stay sane - my advice here, passed down from other friends of mine - put the nappy on OVER the knickers/pants telling her WHY your are doing it (she is still a big girl, she still needs to ask), it also means if she has an accident, she feels it, but you don't get a soggy car seat/buggy.
Then once she has asked to go consistantly or taken herself to the potty for a few days venture out. We did this by accident - i was literally in a rush - threw the kids in the car, got to town and remembered "fook they got pants on and i got no change of clothes!", I just HAD to deal with it and we had no accidents, they even queued in M&S.
After months of accidents and pulling my hair out it happened in a week i would say. (one DT did revert for a while, but we bought him some ontarget balls for the loo, as seen on dragons den, and now he loves going)