To find Olia, you have to go through the little mansion area. After you get Olia, frogboy will want you to go to a frog statue to teleport to an island. You find him and complete his mini missions until you get a cut scene when you approach the big frog statue. Then it's time to teleport back to the swamps and trek home where trouble is brewing.

can you tell me how to find olia? i went through the swamp and she wasnt there