however there was one thing about the timeline here that didn't make sense to me.when julia first meets mrs.rumson she learns that she has been married six months(and presumably living in new york for some time before this).but six months before this the plot was set in 1897 and angelique was actively there.so how much time was supposed to have passed in these few months?
(Note the spoiler icon.)
In addition to Brandon's theory, I'll offer that Angelique and Barnabas didn't return to a present time through the same means (he, I believe, had help from the Leviathans, and she from Diabolos), and though we know that Barnabas returned (hauling the "Leviathan leader") in late 1969, we really can't pinpoint when it was that Angelique arrived from 1897. I read a theory by Joeytrom that she was returned to a point in time that was not long after she was sent to 1796 (only to be burned by Ben). This theory works for me because it gives Angelique enough time-- a full year-- to become a successful model, meet Sky, and be Mrs. Rumson for 6 months. This would make Angelique's timeline (ignoring 1840 for now):
1795 ---> 1968 ---> 1796 ---> 1897 ---> 1969
How does that work for you?