P.M.
It's possible your daughter isn't ready to train if she just doesn't seem to "get it." I've asked lots of parents when and how their kids were successfully trained, and I've done a great deal of research on the subject. It seems pretty uniformly true that the quickest, lowest-stress success occurs only when child shows most of the signs of readiness, which may occur as late as 3 or 4. (Here are some helpful checklists: http://www.parentingscience.com/toilet-training-readiness...) Girls are usually, but not always, mature enough earlier. Children with developmental or speech delays are often somewhat slower.
What I think of as "pre-training" can be started to good effect with much younger children – helping them become acquainted with the potty, perhaps practice sitting, reading stories and watching videos about using the potty, role-playing, getting supplied with big-kid undies, etc. All these things can encourage the child to think positively about the process, and may promote emotional readiness.
The necessary physical and nervous development just take whatever time they take. Children who are "trained" because their parents remind them and/or physically take them to the potty every ___ minutes aren't actually trained. The parents are.
When a child is ready, she'll take to potty training with the same tenacity as when she learned to crawl, walk, or talk. And the actual training can take anywhere from a day to a couple of weeks, with parents supporting the child's lead. But no charts or rewards are generally needed. Just the child's own eagerness to move into her next stage of development.