Jotun.
She had only meant to settle in for a nap. Her belly had been full and she had been content; new to the world at the time, or quite close to new, and so very sleepy. Erupting from the chrysalis had been hard work and she'd only been awake for a short duration thereafter; the sleep came quickly. The caves faded around her.
And when she woke up she found herself sheathed in stone again. It was thinner this time - covered in dust, half contained by a segment of wall as if she had crawled in to a burrow for hibernation. Maybe that is what happened. She could not remember the specifics - only that she had wanted sleep and something had driven her far from where she'd first woken. That explained the sanguine red-brown of the dirt around her now. The warmth, like heavy panting breaths, pulsing across the surface of her shelter.
As her dream receded, drew away from her like a sweeping tide, her eyes open. The shield of stone around her head holds her firmly against the dirt. A tense of her shoulders begins the splintering of the chrysalis there - a flex of her jaws and her neck muscles continues it along. As she pushes against the shielding with her head it comes apart, lingering across her forehead like some kind of armor.
She shakes her pale face and this too falls away, piling in scattered remnants where her head had been poised moments before in the rut of her neck; but she doesn't rise. The burrow she had found so many cycles ago had become too small for her now, and as the hibernation fully slipped from her mind, she became aware of the claustrophobic pressure holding her there.