Depending on your choices during the event, Cookie opens the portal either in the prison, where you first meet her, or in the top right corner of Parverhill. After following her through the portal, you'll receive the Teleport Stone Amagal to return to that place.
Thanks I got the teleport stone, but there is a bug when for some reason even if you choose to arrest the girl she still open the portal at the top corner of pavernhill and not in the prison and the story goes on like cookie stole your money so you can get free 1500 gold instead of 500 gold (I did not check if the money disappear even it did not mention it). I think it is because I unlock the strategic battle system before talking to cookie or maybe because I arrest the old lady that imprison leah before talking to cookie. This is my third playthrough and this is the only difference that I can think of from my first and second playthrough