Because she is not a resident of the Gotham A.D. timeline. She is the Prime Earth version, thrust into a possible future after Milk Wars. The Gotham A.D. version of Violet was referenced in the first issue of the mini.
Even when she lives on Prime Earth, Earth 2's Power Girl isn't considered a resident of that reality. It is possible I am wrong, I am fairly new after all, but I don't think she should be in the category
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