You can't convince anyone of anything until they're ready and willing to be convinced.
The best way to try and get her more interested is to find new flavors, and hope she'll find one that so totally beats the flavor of cigarettes, she'll be glad to switch, but until SHE makes that choice, there's really nothing you can do about it. You can also emphasize how delighted you are with your FREEDOM from cigarettes, but if she doesn't consider smoking to be a form of imprisonment, a ball and chain that must be dragged everywhere, it won't really impress her. Try to figure out what, if anything, she most dislikes about smoking, and emphasize how that no longer applies, if
vaping exclusively.
That's really about the best you can do. If you try to force her into it, she'll resist all the harder.
Andria