Some mission areas don't play well with certain missions. I've noticed this kind of bug in several other crits, and it seems to be linked to stairs and doors (where the npc is required to follow a special path to maneuver through the terrain).The best fix I've found is to try other mission areas until you get one that works. All of the archives can be completed, otherwise no one would ever have earned the archive clothes.
If you wait a little bit and let her go to the destination she is walking to you complete the mission.