H., I know it is frustrating, but she is just not ready. You can fight and cry and be annoyed. Or you can take the pressure off of both of you and accept that she isn't quite there yet. This is a stages thing, she will take a step forward, and one (sometimes two) back. Encourage, act like it is really cool thing to do, keep asking her if she'd like to do it and then back off. She will come to it in her own time. When she does, try a timer set for every 30 minutes or so for the first few weeks. I put the 'potty blame' on the timer...it wasn't ME telling her to go, it was the timer.
When she is ready, all of the tricks will work. Mine was potty trained for almost 4 months before she poop on the toilet. Who knows what goes on in those little knoggins, but you shoudl take as much stress out of it as you can...how many 5 yer olds do you know that aren't potty trained? She'll get there. How bumpy the ride is up to you. Good Luck!