This is sort of a catch 22 situation that works in your favor. Your wife will probably be a tentative rider early on, and not likely to corner hard enough to make pedal strike a concern.

You could also increase the safety margin by using quill or platform pedals with comparatively short bodies. Since women have narrower feet, you don't need a wide pedal anyway.

All in all I wouldn't worry about it, nor would I mention pedal strike at all if you think it might make your wife (more) nervous. You might simply mention how cornering with the outside foot down improves control.