I have SO been there!!! Each of my kids had two tries at training. First when they started acting interested in the potty around 18m-2y. Which didn't go well either time. We'd take a break for a few months and try again. The second time was when they were closer to 3 for the girl and 3 1/2 for the boy.
We were given the DVD 'Potty Power'. Its sing-songy, and has pictures that compares thing that a baby needs to things that big kids get to use. Our girl really liked it and it helped her alot.
Time the accidents. If she has an accident every 2 hours, then set a timer for 1 hour 30m - 1 hour 40m. ask her if she needs a potty break. At each activity change, ask if she needs a potty break. When you go into the bathroom, have her go too, even if its just to sit on the floor.
When she does have an accident, clean up the floor first. Don't delay a LONG time in cleaning her up, but don't rush also. If she messes while your sorting clothes, have her wait until you're done. If you're cooking dinner, have her wait until your at a stopping point. Letting her feel the cold wet of the accident is just as important in training.
When my kids would mess it would be 'hurry mom, I need new clothes....oh, sigh. Ok...slowly walk up to their room... they'd be standing at the top of the stairs... hurry mom my pants are cold... i know honey, that's what the potty is for, not mommy... mommy's don't run in the house.'
When you do need to cleanup/change clothes, always do it in the bathroom. I keep spare washcloths and underwear in the cabinet. It also helps in the cases where FULL washdowns are called for.
Good luck.
M.