This page explains how to recruit Orlha in Chrono Cross: The Radical Dreamers Edition.
Orlha is a young woman who attends the bar in Guldove who’s brawling skills surpass most men.
How to Recruit
When you visit Guldove (Another World) to seek the Dragon Emblem, you’ll end up fighting Orlha. After knocking her out cold, she’ll hand you her Sapphire Brooch. Keep playing till you get Serge back. Then return to Guldove and show the brooch to Orlha.