Maria can be found at the Drunken Cave in Begus after you had Mira's events with the Ice Spirit in the mines in Calterburry. Her events are also necessary to eventually get to Shanna.
sorry for disturbing again but after i talk to the fallen elf prisoner in ironhelm prison, i can't go any further, so i can't continue the quest, what should i do?
Little late but I figured it out. Maria and the Ice Spirit won't spawn if the player warps into the port via a stone plate. The player has to walk out of the port towards the academy and re-enter to get them to appear.
