Upvoted.

While I am highly sympathetic to your desire to not want her to make her decisions for "non-truth based reasons," in and of itself your desire: to want her to want to change her beliefs (back) merely moves the problem back a step. I did not mean to imply that you want to or should want to change her mind by any particular means, but there is only so far that you can constrain a problem before it becomes impossible or impractical to solve.

What you seem to want is for her to change back purely on the basis of obtaining information. If you possess information, know that you possess it, AND she is unusually receptive to this approach, you will probably be able to proceed. If, however, you suspect that she will be commonly resistant to this approach or that she has already rationalized away what new information you will provide (or do so upon hearing it) then it would seem likely that this approach will not work.

I do sincerely hope this situation is of the luckier sort, even if I would bet otherwise.