After Harley's admittance into Arkham Asylum (again), the Joker used his recently acquired fortune to simply hire a new henchgirl, a Fake Harley he picked solely for her looks.

Fake Harley lays on the Joker's desk, counting up his millions of dollars

"Wowza! I could totes count Mistah G's new inheritence money all day! This is so much bettah than workin' at Circus World!"

She lets out an obnoxious laugh, kicking her legs, loving her job

"I mean... 'cept when Joker makes me do bookkeeping... That wasn't in the job description!"