I will be honest. I do not hear the "feminine-by-the-book" sentence-ender わ in real life nearly as often as I did as a kid a few decades ago. This is particularly noticeable among younger women. These days, I hear it much more often in older films and dramas.
If a younger woman of today used this わ more often than her average friend, she would probably end up sounding comically upper-middle class. Japanese women know that instinctively, so they will not use it like the textbooks used by Japanese-learners may tell you.