sl1dr

I have solved the issue. Sylgja seemed to disappear from the temple after the ceremony, but I went back just to make sure and hse was wiaiting patiently for me to tell her where we would be living!

Unfortunately I did not talk to Sylgja after the wedding ceremony so I am unsure as to her whereabouts. I do not own a house, so I assumed that she would return to her home at Shors Stone. When checking her house though, it remained locked, and she has not appeared at all. Does anyone know where she might be?