My experience is that females (as a species) are less aggressive than males so encouraging them to swing at balls they can hit pays later. Boys are the opposite.
The girls I coached with a take a walk approach at a young age ended up watching too many called strikes as they got older. The ones who I encouraged to swing at a younger age are more aggressive and have more fight in the box now at ages 16-18. YMMV.
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This echoes my experience, too.
A generality to keep in mind..."Boys need to play good to feel good. Girls need to feel good to play good." Be a builder of their self-confidence, as well as their skills.
A TB parent's life...Drive. Write checks. Eat tacos.