There seems little reason to panic; the little that Eponine has seen of this place she has landed in has convinced her that it is a far better place than the one she had left behind. Here, she has money and a room, even a room with more than one floor, so there doesn't seem to be much of a reason to wish to return to her former location.

"Oh!" She has just remembered the poor state of her clothes: the blood and the tears in the fabric. "Why, I had nearly forgotten. It was a gun, monsieur, and I put myself in front of it."

That explanation is hardly accurate, but it hasn't occurred to her to explain just why she put herself in front of a gun. "It is a curious thing, because I did not plan for that."