Hi J. :) I really do hope my experience will help you navigate this stage in your daughter's life (trust me, if done with a sense of humor and a lot of patience, potty-training won't be as arduous as it sounds, and you'll have so much more confidence as a mom and in your kid's abilities to know what they need and when).
My son turned 3 in Nov and I tried encouraging him to use the potty since he had turned 2! Back then, he was doing well for about 3 months when i freaked out one day when he had an accident on our new cushioned chairs and since then he has reverted back to diapers - totally my fault since I knew as I as yelling, I was making big mistake #1: don't freak out about accidents...
Surprisingly this christmas, he just one day decided he didn't want anything to do with diapers and we just let him go bare-bottomed around the house for about 2 weeks till he got the hang of using the potty. (I knew he'd be fine when my sister came to the kitchen for breakfast and told us that she'd just witnessed my son poop in the potty, get up and dump the poop into the toilet, flush it then rinse out the potty in the sink as he stood on his stepstool!!) - btw, I don't reccommend letting your kids do all that on your own, but let them see the mechanics of cleaning up after he/she uses the potty.
We had a potty for him in every bathroom and made it very easy for him to access them, but now we just have step stools at each toilet so he can reach/stand up/hop on the loo. We'd used to put a pull-up on him at night, but to my shock he'd either hold his pee the whole night till early morning, or wake us around 2 or 3 to ask to go to the bathroom (i felt like it was a miracle).
The best piece of advice i got was from my cousin who told me to make the committment NOT to go back to diapers for myself, not for my son (i know it sounds melodramatic, but if you think about it, it really makes sense)... last year, every time my son had made progress in the potty dept i'd regress him back by 1) throwing on a diaper when i felt taking him to the potty in public didn't seem convenient, 2) i'd scold him for having an accident and assume he still wasn't ready to be diaper-free and again just go back to diapers, therefore reinforcing his dependency on diapers as well as my own!
This time around, i put all the diapers away (except for a few pull-ups i used for night time - btw, i haven't used a night time pull-up on him for over a month now!), made sure i asked him to pee/poop before we left the house, chucked my anger/frustration about accidents out the window, gave lots of positive reinforcement, and had lots of extra underwear/clothes in a bag in the car at all times. changing my attitude towards the 'trials of training' had as much to do with allowing my son to teach himself how to use the toilet.
Well, hope this helps and good luck with it!