While Jessica is at fault, Alina is at fault, perhaps more at fault then Jessica. Jessica did not come to the recital because she was busy working for an entire city, Alina ran away from the recital because Jessica did not come despite her promise, up to the tippe-top of Mt. Ebbot, fell down, killed monsters either in self defense or was mad about her mother not being there at the recital, then meet Asgore, Alina knows that Asgore is a nice monster, however, Asgore has no choice, Alina tried to spare Asgore but Asgore broke her mercy button, forcing Alina to fight or die trying, in the end, she got stabbed by the king's mighty trident, reuniting with someone who thought was gone forever, Noah Rutrow (her father), both of them hugged eachother, and probably had some father and daughter time together, meanwhile Jessica was left in a state of guilt and grief, she knows it's her fault for braking a promise, but she did not factor in the fault of her daughter, I feel very sorry for Alina, Asgore, and Jessica, they are all kind to eachother. (Imo, it's more so Alina's fault then Jessica's.)