You don't say how old she is, but "training" for over a year is a rather extraordinary length of time, and indicates she really wasn't ready when you started the process. So she may by now be annoyed by or resistant to constantly being urged to to what she may not be emotionally ready to accept yet. In fact, long training actually makes many children more resistant. On top of that, the information that she'll have to succeed "all the time" into the indefinite future can be pretty overwhelming and discouraging, particularly if she doesn't yet know where that commitment will come from.
However, since she has shown she is physically able to meet your goals, at least sometimes, she is probably getting very close. Having a prize at the end of that ordeal is a problem, though. The prize is her new big girl skill, and new ability to manage another detail of her life. She won't and can't do that if, in her mind, it's all about Mommy wanting her to succeed. If you can remove all parental urging, manipulating, pleading, demanding, and even rewarding from this equation, that may give her the leeway to 'find' her own motivation.
Try simply telling her you are proud of her and KNOW that she'll want to use the potty when she's ready, ask her if she'd be more comfortable with diapers for now, and give her some choice. Keep up with positive messages about the advantages of using the toilet, but keep those low-key. This is ultimately a process the child must own, so the sooner you can give her that option, the better.
She may come around quickly. In a few days, perhaps a few weeks, she may simply realize she'd rather not be in diapers or need to take the time to get changed. But be aware that readiness is not only physical and developmental, it's also strongly emotional. You might find the "readiness" checklists and other tips here to be helpful: http://www.parentingscience.com/toilet-training-readiness...
And incidentally, taking away her reward by changing the rules afterward? Not good psychology, and not fair. Your agreement, as you describe it, was that she try to use the potty "while on vacation." She worked hard to meet that goal, and "she did great." She earned her prize, and THEN you told her the goal was extended to "all the time," and took back her prize. I'll bet she was upset. Will she still trust you next time you want to make a deal?