It's Helen, the nun. You need to finish Helen's quest first. After that she'll be in the shrine on the altar to the left.
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For Helen's quest:
-talk to her outside of the blacksmith's
-talk to lazy hunter in the shrine farm
-have Emily craft the Repair Kit item. You might need to collect some Magnolia Wood by breaking the logs with Grace in Deep Woods.
-take the Repair Kit to Helen in the second floor of the shrine.
-visit the shrine at night and talk to Helen in the Relieftionary and you're done!