You need to read the No Cry Potty Training Solution by Elizabeth Pantley. Everyone has there own method and recommendations but this book to me is the best. It will first assess if you and your daughter are even ready and if so, then the steps to take. Patience is KEY. What you are experiencing right now, although frustrating, can be prevented. I spent a good week with my son - ALL day, this meant, when he was playing in his room, I wasn't off doing laundry or anything unless he had just pottied, I was sitting in his room with him, watching for cues of needing to go. If your daughter has time to poop and then play with it, she is being left alone for too long. I would take a break from potty training for 2-3 months and then give it another try. For now, though, you pretty much know when she poops, so just make sure to change her diaper asap.
I'm adding the following after doing some thinking: the reason I think potty learning for my son and I have actually been fun these past few weeks is because he was more than ready. In the past when I have tried and began to get frustrated, I backed off for months at a time. He is three and to some that might be old, but he and I were both more than ready this time and I believe that is why it was such a success. I don't believe in rushing things like this, it's old school to get a child out of diapers by a certain age. Back in the good ol' days, all babies were in cloth and households didn't have washing machines, it WAS truly a lot of work to wash diapers back then, so Mom's were in a hurry to train their kids. We are lucky now, we can take our time, watch our kids cues and guide them in to underwear when they are ready. It is not a sign of intelligence to be out of diapers early, it doesn't mean you are a great parent if your child is out of diapers by 2, none of this will matter in 5-10 years. However, if rushed, disciplined, punished, made to feel shamed, etc.. while being trained too early, a child can have issues later in life. Like another poster said, it's not like they'll be in diapers in highschool. So sit back, relax and enjoy the ride.
M.