Based on the search results, it is unclear what happened to Koala in One Piece. However, we do know that Koala is a former slave who was set free by Fisher Tigers rampage on Mary Geoise. She sailed along with the Sun Pirates to reach her hometown). Later on, Koala reappears during the Dressrosa Saga as a member of the Revolutionary Army, led by Monkey D. Dragon, and a high-ranking officer in this militia group. Working alongside Sabo and Hack, the trio works to help commoners and aid them against the vile acts of the world government. It is also mentioned that Koala is indebted to Jinbe, who was a member of the Sun Pirates that granted her rescue twelve years prior, even though they still have to reunite in the story. However, it is unclear what happened to Koala after the Dressrosa Saga.