Despite having seen Amelia merge with her brother before her eyes; from your kindness she can tell that deep down you are still the Amelia she admired. As such she does not hesitate to take you up on your offer. With a press of a button you integrate your sister into your new self in much the same way you became Amelia. As the process finalizes you are overcome with a felling of completeness, no doubt this feeling come from the part of you that was once your sister finally having her wish to be like Amelia fulfilled