Potty Training Blues!!!!

Okay, so potty training Rylee is soo much harder than I thought it would be!!:) I have tried 3 times before, but she has not showed much interest... I decided to try again, because she seemed interested while Hadley was staying at our house... We started on Saturday & she was a rock star!! She did so good, she even went poop... All day she was like a pro & I thought that would be it... Sunday she woke up & decided she wanted nothing to do with it.. She has been asking me to change her & wants a diaper! This is really exhausting & I feel like I am forcing her to do something she is not ready for?? We have a potty training video called Potty Power that she has been watching & it seemed to really help... She has been holding her pee for hours on end, & is so whining... ( kind of how I feel ) I can tell that she is not comfortable with what is happening? We are on day 3 now, I am not too sure at what point I should stop? I guess we will try for one more day & go from there? I doesn't seem like it supposed to be this hard?