This is a very good start to your story, Sadie! I think it's probably my favorite beginning of all of your stories. These four chapters are very interesting and sad. It's a great introduction to the characters and the situation that makes me want to know more, and you're giving me a lot of questions I want to know the answers to!
"Stacy remembers the day that her Mother put the pictures away." That's such a good sentence. It drew my attention because it says so much with so few words. Good luck with continuing your story; I'll be happy to read more!