She only looks marginally annoyed at the implication that this wasn't her spot first, but rationally she knows Eponine's correct. She also was aware that the girl would be leaving soon and so arguing about stupid things like that wasn't necessary at all.

"I think I'll pass," she said with a slightly nervous laugh. She wasn't sure how she felt about a child offering to play target for Eponine, but at the same time she knew demigod children were strong enough to handle it. "You'll have better luck with a tree though unless you can convince someone to build you a spinning wheel."