Oration 24 (on Cyprian), 9–11 — as quoted by Pitre (p 86)
Justina, in the face of danger, 'took refuge in God' and spent time 'imploring the Virgin Mary to bring her assistance, since she too was a virgin and in danger.'
No freely usable English translation of this passage is online, so the note keeps Pitre's quotation and links to the full text. Translation: as quoted by Pitre (Oration 24 is not in the NPNF selection).
In Jewish Roots of Mary
Why it is cited
The virgin Justina, in danger, 'imploring the Virgin Mary to bring her assistance' — a fourth-century record of asking Mary's help, from a Father who defended the divinity of Christ.