Replicate her voice done by Tara Strong in The New Batman Adventures: https://youtu.be/6afQFd2XFdg?si=BfsssFfcC2xunHXb

If you must do a different voice, try

Danielle Judovits from The Batman (2004):

https://youtu.be/nDKyRU5TIhs?si=ORsGGA0Nt-8GctKY ,

Kate Higgins from Batman: Year One Motion Comic - https://youtu.be/Zzclv_m8vXk?si=Wc1c2e2d7WnwPYOR ,

Sarah Hyland from LEGO DC Comics Super Heroes: Justice League - Gotham City Breakout (2016): https://youtu.be/kyobvmXtDWA?si=KkoBhu2Tb5tCvWEt ,

Peyton Roi List (actress, born 1998) from Batman: Hush - https://youtu.be/xNEZxIBfXBg?si=_4NzwRkRmaRtx1Kg.