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I just looked at the planned parenthood site and it has a New Relic RUM, and a AB testing beacon. There are no ad/data beacons on the site.

She probably clicked a link from a search engine or other source that could have shared her interest. Even if the service themselves isn't tracking, very few people type an exact URL in. Even if they do it is often being transmitted to Google or others stroke by stroke

Granted a "normal" web site has more like 30 or 40 trackers these days.

How does Planned Parenthood relate to hair loss treatment?

Forhers is an online telehealth platform with a reproductive healthcare component.

https://www.forhers.com/sexual-health

https://www.forhers.com/birth-control

Planned Parenthood also offers birth control ordering through the mail. adrr says no tracking/retargeting, so could be a coincidence.

I doubt PP was the only female-focused website your wife visits.