Pearlina and the Water Faery

This is the story of Pearlina, a tiny mermaid, as small as a doll, and Merrow Finless, a Water Elemental Faery who loves mermaids.
A loose, mermaid-themed retelling of "Thumbelina" by Hans Christian Andersen, set in the same whimsical mermaid universe as Kae-Leah Williamson's previous Merfolk Tales novellas, although it can easily be read as a stand-alone.