RealMazeRunnerSimp
Her past unbeknownst to her, Sumirei had been in the Glade for 2 years, brought up in the Box with the original Gladers, and she's made rivalries and bonds forged from steel. Her life crumbled apart, but is held together by the Glue, when another girl saying everything is going to change when she comes up.
And she wasn't lying.
Just like everyone else; she knew nothing as to why she was there, how she got there, and why specifically her. But she knew she wouldn't succumb to the Creators awful ways, and steeled herself to better fit the Glade, determined to pass their stupid trials, but equally as terrified as everyone else.