- Katherine graduated high school with honors at age 14.
- Katherine graduated from university at age 17.
- Katherine was a softball pitcher and ballerina before she caught the "acting bug".
- She has played the same character (Mia Smoak) in five different series: Arrow (2012), The Flash (2014), Supergirl (2015), Legends of Tomorrow (2016) and Batwoman (2019).
- Katherine is portraying "Fredrika Armfeldt" in Broadway's "A Little Night Music", starring Bernadette Peters and Elaine Stritch. (October 2010)
- Despite portraying Oliver and Felicity (grown-up) daughter on Arrow (2012), Katherine is four years younger than Emily Bett Rickards.
- Good friends with Tom Sawyer & Huckleberry Finn (2014) co-star Joel Courtney. They both review movies together for "Kids Pick Flicks".
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