To a large extent, the outcome of this will depend on her perception
of you as a person. If you demonstrate a high level of caution and
competence in your flying (and when you drive together), her fears may
gradually abate.

My wife was pretty fearful of flying with me when I started again
after 30 years on the ground. However, after a fairly serious auto
accident on the freeway, she feels more secure to fly now, although
still has some reservations about IMC.

These problems are based more on perceptions than statistics, right or
wrong.