Thanks. I've read so many origins it's getting confusing.
Tempest Tossed: Diana saves shipwrecked refugees, which leaves her caught outside of Themyscira's magical barrier. She arrives in Greece as a refugee. Steve only makes an appearance after she's been there for a few weeks.
Warbringer: Alia (the secondary protagonist) is saved by Diana after a bomb detonates on her ship. They both leave Themyscira when Alia's presence destroys the island's balance.
True Amazon: Diana is exiled to Man's World after a tragedy she caused.