Was she raised in the Witnesses or did she join later in life?
I ask because, while the belief and control system that comes with the Witnesses can be difficult to shake in any case, a lot of the beliefs can be very ingrained and hard to move away from for people who were raised in that faith. I've been out for 10+ years, as an example, and I'm still uncomfortable attending birthday parties (or particularly celebrating my own). In my experience, because so many of the Witness practices go against social norms, that rationalization that you mention about the easter candy begins to develop almost as a defense or coping mechanism. It's a way for us to feel normal, almost, even if just tangentally.
Although I certainly don't have the total grasp of the situation that you would, there are a couple of things that I would suggest.
It does sound like she's on the fence, so she's certainly questioning things, and I would suggest gentle encouragement of that. Ask questions that would help lead her to see the world outside of the Witnesses. I say ask, because the Witness religion is set up so that outright criticism feeds back into evidence that the Witnesses are right, and pushing the issue can have the opposite effect that you're looking for.
The other thing is the sense of community. Again, looking back on my own experience, in some ways that fear was making a deeper fear of losing the community and support structure provided by the church. I didn't want to die and not be in Paradise on Earth(tm). So help her make or strengthen social ties outside of the Witnesses. Seeing that non-witnesses are not all the immoral, God-hating, threats to spiritual life and limb that the Witnesses teach will go a long way both in helping her find a path completely away as well as helping her start to de-wire the Witness programming. Ultimately, though, it will take time - especially if she was raised as a Witness. The mindset is so insidiously wrapped around every aspect of life that she may always be working against it on some level, no matter how far she distances herself from the church. So be patient and understanding, even if it's something that you don't understand.
I know I and many of the ex-JWs here on the board would be happy to talk with her, about some of the conflicts or questions she may be having, or even just about the experiences we've had in and outside of the Witnesses. Talking to someone who's seen both sides of the fence, who has seen that fishbowl inside and out, who's left and is still standing, can absolutely make a difference.
So good luck, and I wish both of you the best.