If this was taken as a wedding photo would you not expect the ring to be visible?
Lovely photo but I’m not sure of her heritage - she could be from anywhere.
If you are trying to identify her origins by the lace, could it not be that a (possibly) wealthy woman could have purchased lace from anywhere? The lace looks like a tunic of some sort rather than part of a dress. There is a skirt visible, and a ribbon of some sort.
Does any of that tally with a wedding or other ceremony related to a specific culture? It’s possibly a bit racy to be a religious one.

Date wise I think this is very tricky because not much clothing is visible. Hairstyle and jewellery? Could be Edwardian, though my first thought was 1950s, though I think the hairstyle is a bit ‘loose’ for that era.
If you can find any identifiable markings or studio name on the photo that might help .... even telling us what kind of card or mount it is on might give dating clues.