It was definitely an emphasis. This might just come down to taste, then. I found the flashback welcome, since it presented a deeper/different perspective from Our Lady's view. I think it's conventional to claim she experienced the most and perfect grief for Our Savior. The flashback tries to communicate that grief. It's alien to us, because none of us raised the Christ Child, none of us (literally) bandaged his scrapes and bruises as the Blessed Mother did. Add to that of course that none of us were holier than her either. Anyways, it's quite uncomfortable (the flashback) and yet it should be. Useful to be reminded of how in our weakness and self interest, that kind of grief would break us.