I second the e-cigs, if she has any issues with the chantex. She needs to keep trying different strengths and flavors.
For me, what actually finally worked was twofold. 1.. I didn't quit, I stopped I plan to start again on my 90th birthday (I will probably go ecig then though). 2.. I literally changed my entire life. I met my honey and the people I hung with and the places we went there was no smoking.
I can actually now have an occasional one and be done with it, but do enjoy the ecig more.