Husband died (saving Dinah's life).
Dinah decided to change Earths and then got involved with Green Arrow.
Around 10 years after that, people thought the (implied) age difference between Dinah and Ollie was getting too great, so they retconned it so that the Black Canary who actually came to Earth-1 was really Golden Age Dinah's daughter with
ALL (
!!!) her mother's memories implanted so that this Dinah actually had thought she was the Golden Age Dinah (but without the memory of having given birth to herself).
All that went away after
CoIE.