Cassandra Cain trades in her Batgirl outfit for a Robin costume in a fantastic artwork that shows how she’d look as Batman’s classic partner.

Source: https://screenrant.com/batgirl-cassandra-cain-robin-fanart-kara-huset/

In the memory, Nightwing is seen accusing a sleepwaking Harley of kidnapping Batgirl.

Source: https://comicbook.com/dc/news/harley-quinn-who-killed-nightwing-revealed-season-four-episode-nine-recap-spoilers/

Schwartz recounted in Daniels' book, "I don't remember the exact details, but I was asked to create a Batgirl.

Source: https://www.slashfilm.com/1232747/batgirls-creation-was-a-last-ditch-attempt-to-save-adam-wests-batman-series/

The debut of Batgirl didn't generate enough public interest to save the show, motivating Dozier to move on from the Dynamic Duo and abandon this project.

Source: https://www.cbr.com/the-60s-camp-insanity-of-batman-meets-godzilla/

They were joined by Alicia Silverstone playing Batgirl.

Source: https://www.cbr.com/every-batman-actor-time-as-batman/

This allowed her to become Batgirl once more while simultaneously continuing to work as Oracle as she's now done for years in the comics, making her a key member of the Bat Family.

Source: https://screenrant.com/batman-brave-bold-movie-batgirl-leslie-grace/

WB, though, has canned two people of color's solo films: Leslie Grace's Batgirl and Sasha Calle's Supergirl (for now).

Source: https://www.cbr.com/superman-legacy-perry-white-dcu/

When Batgirl goes missing, Nightwing opts to look for her without Harley, so Harley enlists Batgirl's roommate to follow a lead into the mountains.

Source: https://comicbook.com/dc/news/did-harley-quinn-season-4-just-kill-spoiler-nightwing-harvey-guillen/

While they've flirted with reconciliation, Nightwing is currently dating Batgirl.

Source: https://www.cbr.com/dc-comics-couples-ended-too-soon/