Here's a really helpful site that gives some great "readiness" checklists, plus the skinny on various approaches to training, their advantages and challenges. It's promising that your daughter is successful with peeing. But I wonder whether she is matured enough for success pooping yet. See if you can find your situation here: http://www.parentingscience.com/potty-training-tips.html
Ultimately, the child must have significant control, or else she's not trained (but Mommy is!). A number of factors are needed for potty training to succeed: the child must be able to notice and recognize the urge before it happens, she must be able to hold it till she gets to the potty (sphincter development), she must understand the value of training (how convenient it is, compared to diaper changes, and that it is an exciting new skill), and she must want to be trained (emotional readiness). It's extremely common for pee and poop training to happen at different times, because the sensations and effort required are quite different. Pooping often comes later, especially if there has been recent discomfort from constipation.
Sometimes rewards like toys or treats work in the short run if only motivation is lacking. But that introduces the very real possibility that rewards/bribes will need to escalate to keep 'em motivated, and that is a mistake parents regret later on. When a child is truly ready to succeed, that will be the reward in itself.
So, what I would suggest is that, as hard as this will be, you drop any "expectations" about training. Tell your daughter you are proud of how well she's growing up, and express your confidence that she will use the potty when she's ready.
And she will. Most kids WANT to make this developmental step when they're able, just as they want to walk and talk when they're able. Your daughter may need "space" to work it through for herself – to focus on her sensations, on cause and effect, and not on mommy's state of mind, or possible rewards. Or she may need a few more weeks or months.
Diapers, at least for pooping, are an acceptable alternative to repeated failures or withholding poop, which can become a serious problem. Some parents have reported success with cutting a hole in the diaper so the "feel" is still familiar, and having the child sit on the potty to poop. After a couple of successes, the hole can be made larger, or the diaper can be omitted. (I haven't tried that one, just passing it on.)
It's probably much too early in the process to consider your daughter a
"delayed" poop trainer, but if that eventually becomes the reality, here's a site that offers a process that has succeeded fairly quickly for a couple of moms I know: http://www.rogerknapp.com/medical/pottytrainingrefusals.htm
Good luck. She will get there!
ADDED:
KB beautifully outlines how to take gradual steps toward success. Small steps may seem slow, but allows the child to experience successes all along the way, and reduces any anxieties about using the potty.