It seems to have been Proba. The first printed edition of Proba’s Cento Vergilianus de laudibus Christi came out in 1474. That was only five years after the first printed edition of Virgil himself (1469). It’s a good indicator of her reputation in the Renaissance.
Today, Proba benefits from the rush to find female writers to study, and she has been reassessed as a Good Poet again. I have Wikipedia’s word for it (“During the 19th and 20th centuries the poem was criticized as being of poor quality, but recent scholars have held the work in higher regard”). I’m more likely to value a Renaissance critic’s opinion of what’s “clene and chast Latin” (thus Wikipedia tells me John Colet described Proba’s poem) than a twentieth-century critic’s, so the reassessment of Proba is welcome.