Helena fought alongside her father as Robin. During her father's final moments she defended him from the Batplane by firing upon attacking Parademons. She witnessed his death when the tower he was inside exploded.
Superman, Batman and Wonder Woman were killed, but they managed to destroy Darkseid's towers, disabling the Parademons and saving Earth. As Supergirl caught up with Robin, and without any time to grieve their lost mentors and family, their attention was caught by a Boom Tube portal with a lone figure appearing within it. The Earth's last two remaining heroes plunged into the portal.
The portal led them to Earth-0. Karen and Helena established new identities to blend in, but they also sought a way to return home.
Current Version:
The Huntress
Former Version:
Robin