Sounds like you have a good plan, but make sure that your family understands the importance of keeping Sammy on a schedule! As much as keeping her food and cage situation the same, maintaining the schedule you have developed with her is just as important. Changing things or letting Sammy do what she wants sends the message that it's ok for things to go Sammy's way from now on. The fact that you will be gone for a week will only allow reinforcement.
I speak from experience. I have worked for a year and a half with my quaker on nest/cage aggression. I leave her and her sister (a mild-mannered sun conure) out during the day and they will share each other's cages but are (were) for the most part certain of each other's boundaries. At night she goes into her night cage in a separate room - a bare bones cage without food, which she knows is a temporary spot to feel safe at night. All was going well until I had my brother sit for them while I went out of the country for a week. As soon as dusk hit, the quaker would go curl up in the blanket folded on top of the conure's cage. Since she seemed happy there, my brother let her spend her nights that way. Since the set up is fairly open, there are lots of "points of defense", meaning that a) quaker doesn't get rest because she is defending nest and is cranky, and

defending the nest makes her more certain that it is hers. That was at the beginning of October. I am still fighting the quaker every day to keep her from terrorizing her sister into the corner of her own cage! She now thinks BOTH cages belong to her, and because she was allowed to spend her nights on them, she feels certain that both cages are part of her extended quaker nest! I have to keep them locked in most of the time now, and it's going to be a long way back to even getting her to the point to start recognizing boundaries again.
Make sure that your family understands how much quakers are like children - quickly and easily moldable, petulant, and always in need of parental guidance, but unlike children, it is not ok to spoil them even a little bit!
Thanks that is a great piece of advice. I am actually going to copy and paste this into my instruction manual (lol) for them so they understand and realize that it's not just me saying these things.