It's bigoted to target people because of their nationality.
Someone has been stealing things from the office that Elise manages and corporate is upset.
Elise wants to find the thief.
Elise calls  in every employee for questioning.
Elise calls in the Mexican employees for questioning because she thinks they're more likely to break the law.
Elise eventually finds the thief and is rewarded by corporate.
The employees file a report against Elise for racism, and she is fired.