Rose ignored Sam.
Since then, Rose has uninstalled the app from her phone. When Oliver and the others found out, they called her weird because almost every adult in Astington owns and is active on social media, but she doesn't.
Rose didn't want her private life to be exposed to other people. Her family and close friends were few; they still lived in the same city and saw each other often, so there was no need to upload something on her Instagram, right!?
However, Rose is also not an anti-social media persona. Sometimes she still needs to open her Instagram account if she has free time and needs to see something. But the commotion caused by Willard Harper made her completely delete the application from her cellphone. She was traumatized when Willard Harper's militants attacked her.