I wonder what's in the bubble? I remember dipper saying that they need to keep in mind that it was created by Bill and that they need to be prepared for the unthinkable. Does anybody have any ideas what could be inside. (Besides Mabel).
My guess is: memories of gravity falls with her brother, her summer romance fails, lots of Mabel things like stuffed animals and glitter. Also I believe there will be a few traps. I also think that she might not want to save gravity falls. She wanted summer to last forever and now it can since time has frozen. Also that she will at least be friend Gideon.