Fantasy Friday: The Little Lac-Maid

Down at the bottom of a glacial lake,
High in the mountains, where the water's cold
Is most profound, a lac-maid's worst mistake
Occurred one day when she found, set in gold
A shining opal. Like her ocean kind
(Called mermaids) she did dearly love a gem!
But this one started playing with her mind
Ere she could even bring it to her den.
The winter comes much sooner, up so high,
And her trout half would let her hibernate
Beneath the ice until spring's thaw was nigh.
This year, though, addled, she thought t'would be great
To pass the season up atop the ice.
Her frozen corpse has been discovered twice.