Potty training advise?

My daughter is 3 years old. We've been trying to accomplish potty training for 4 months now. I put her in panties during the day and pull ups at night. She really doesn't have a problem going tee tee in the potty unless she's playing and gets side tracked. I reward her with a sucker everytime she goes to the potty. The problem I am having is her going number two. She will not do it in the potty for NOTHING! She waits til after she poops in her panties to tell me she had to poop. She will be 4 in January and would REALLY like to have her completely trained by then but it seems like it's impossible. I've tried explaining to her if she poops in the potty she will get a big reward like a new barbie or a new toy or a new movie... but NOTHING!!! what gives!?