It would normally take a normal person Decades to reach the Twilight Era but the Great Dick has the magic to instantly travel through space and time so it took her a matter of moments and she arrived in the fountain of one her descendants whom was already turned but didn't have the same powers as before like something was blocking them. So she simply traveled a few feet to Corrupt Ilia and in doing so somehow she was a lynch pin and the entire Light portion of Hyrule was changed and Dicklia hopped on the descendent of Edickna and rode to the Mirror of Twilight to corrupt that realm as well since the now corrupted Fairies brought it back.