The answer is refreshingly simple.
Katie Holmes' departure from Christopher Nolan's Batman trilogy was due to quite a simple reason.
Putting the dark into DC: what would Christopher Nolan's Extended
Rachelhood: Batman, Boyhood, and Suspension of Disbelief
Movies Archives - Page 10 of 54 - GPU
Katie Holmes returns as Rachel in The Dark Knight
Christopher Nolan's Dark Knight Trilogy Needs Another Film
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Maggie Gyllenhaal's Instagram, Twitter & Facebook on IDCrawl
Tom Cruise's Ex-wife Katie Holmes Does Not Regret Saying No to
Doctor Strange 2 Star's Career Narrowly Took Major Detour When The
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One for the ages; The Dark Knight Trilogy – Brush and Palette
It was right for me at that moment: Tom Cruise's Ex-Wife Katie
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Katie Holmes's Instagram, Twitter & Facebook on IDCrawl