Yeah i found her in the forest before Junon after a few battles but i said the wrong things so she ran off... so i re loaded and found her again after what seemed like AGES and said the right things and now she is partying with my party!!!!!
You can get her at any forest and im pretty sure you can find her again if you fail to get her first time... hope this helps
by the way the further you are in the game, the easier it is to find her, because after clouds coma i literally took one step into the forest and she was in my face (this was on another save obv)