The radius affected by the Protean Dungeon is much, much wider than that of any other dungeons Elisabel has been to. The incongruous, storybook-like patch of dense forested woods is visible from a distance, and even after she reaches its edge, there is a while of walking to get to the entrance.
And it feels amazing. The magic in the air is so strong it actually has proper physical effects on her, directly. If her nose was kinda blocked, no it's not; if she slept badly, no she didn't; if she had any aches or pains, no she doesn't. She can feel herself think more clearly, not because she's thinking any differently but just because the little distractions are gone, she has more energy, more raw executive function. That's not to mention the senses, how everything is clearer and sharper and more understandable. It's like she's lived in a badly lit, underwater cave her whole life, and now she's finally swum out to the surface under the sun.
Plus, the area itself is friendly. Despite being some sort of forest, there is a clearly-demarcated beaten path for her to follow, which manages to simultaneously look like it emerged naturally from usage and yet be entirely clear of annoying stubborn tree roots or rocks or patches of dry earth that might make the way treacherous at all. The oppressive desert sun gives way to a gentle morning light counterbalanced by a soft, cool breeze carrying a sweet smell reminiscent of oranges but ineffably different, somehow. On top of that, there are no monsters, or at least no hostile ones; fairies, yes, and butterflies with iridescent wings and a small herd of jackalopes bounding past her and will-o'-the-wisps that chime like a choir of bells singing in harmony, but nothing that will ever attack her.
It's an open invitation, and it's so, so tempting.