If she's a strong kid, it may very well be a mechanics issue more than just about arm strength.
Water-bottle drill...https://wassermanstrength.com/high-level-throwing-water-bottle-size-for-youth-athletes/
Thank you Eric! I will try that drill with her.
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It will be the best money you've ever spent on softball!This^^^ and then buy the book and work the progressions, learn the lingo.