No Exit Lesson Plan

What does Inez mean when she says, "Well, Mr. Garcin, you've got us in the nude all right"?

Inez means that Garcin has put everyone's history and reasoning on display, and that now everyone has been honest with each and revealed themselves. The implication also seems to be that Inez is mocking Garcin, as he wanted everyone to admit what they'd done wrong in order to be able to help one another. Inez is challenging Garcin, daring him to now use the information he has to complete the task he set out to do: work out their salvation.

Estelle expresses deep distress when Olga begins telling Peter about the things Estelle did on Earth. Why is she so distraught?