Innocentia was tired.

she headed into her room and saw her room mate was gone so she went to her bed and pulled out the small box of rocks and set it on the bed.
there were a few rudimentary supplies in one of the cabinets, including a big bowl. "this'll have to do" she filled it up and walked back to her bed, setting it down on her desk she slowly dropped the rocks in it and it began to take on a clear, almost glowing appearance. 
she quickly pulled a piece of paper out and quickly scribbled down "please leave this bowl alone, it's my only way back, thanks" and quickly wrote her name at the bottom, she had picked up writing quickly and so she had spelled most of it correctly and even spelled her name correctly.
then she sat it down beside the bowl and took a deep breath, liquefying herself, then she placed her hands in the bowl and slowly dissolved into it, going to the mythical resting place of all Naiads.