ID On Woman In Tiara/Crown?

Perhaps Salonina? Mediolanum mint?

Mediolanum mint would be interesting - Salonina died at Mediolanum during Aureolus' revolt, though who killed her and when is not known. Aureolus was leader of the elite cavalry under Gallienus, on campaign to return the Gallic empire to Rome, but lost Gallienus' favour. He rebelled and captured Mediolanum, from which he began issuing coinage of Postumus and reportedly requested his assistance in defeating Gallienus. Postumus never sent help and Aureolus eventually surrendered to Claudius Gothicus who had himself usurped the purple from Gallienus.