Rise of the Runelords
If for some reason the PCs wait until after sunset to investigate the Glassworks, Tsuto and his goblins have returned to Thistletop; Ameiko is placed in a cell there (in area D9), and if the PCs don't rescue her in a few days, she is eventually sacrificed to Lamashtu in area D12, yet another burnt offering to appease Nualia's wrath.
Ameiko is conscious but badly wounded, stable at -2 hit points and in no shape to aid the PCs unless they can heal her. Even if healed, she remains distraught at her brother's treachery. Tsuto revealed to Ameiko that he and several other mercenaries were led by Nualia and hinted that she's got big plans for Sandpoint's future. Tsuto warned Ameiko that she didn't want to be in town when those plans came through, and offered her a chance to join his group at Thistletop. Ameiko recoiled at the suggestion and slapped her brother in shock that he'd sunk to such a low. He responded by unleashing his goblins on her. They overwhelmed her and left her here. She's grateful for the PCs' rescue, but is eager to leave and warn her father. If the PCs don't break the bad news to her, she learns soon enough, taking the news stoically.
Ameiko has no further role to play, officially, in the Rise of the Runelords Adventure Path, but this can certainly change in your game. Certainly, after the PCs rescue her, she rewards them with free room and board at the Rusty Dragon for the rest of their lives, and with her father's death she becomes the sole heritor of the Kaijitsu family-whether she likes it or not (she doesn't, really), Ameiko has become Sandpoint's newest noble. As mentioned in the introduction to this book, Ameiko has a much larger role to play in the Jade Regent Adventure Path-her full statistics can be found in Pathfinder Adventure Path #49 if you wish her to have a larger role in your Rise of the Runelords game.