Harley Quinn:
You were checked into Arkham.
Catwoman:
You caught her stealing from you.
Poison Ivy:
You were held as her captive once.
Batwoman:
She saved your life.
Wonder Woman:
At one of Bruce Wayne's parties.
Black Canary:
You're an old friend of Oliver Queen.
Zatanna Zatara:
You met her at a magic show.
Killer Frost:
The two of you met at a prison.
Talia al Ghul:
You trained under Ra's al Ghul.