She's swimming in deep water, somewhere out of the way and a bit isolated, far away from everyone, simply to get away from it all and enjoy the freedom of it for a while. She's singing underwater. The way her voice changes below the water as opposed to above is beautiful. It took forever to get right. Then she feels her connection to the world, always lurking in the back of her head - snap.
Well, that's a little concerning, but it's something she can worry about later. She's hardly in any danger. She's relaxing right now. She keeps swimming around in the cold depths for a while longer.
When she surfaces and swims inland to figure out where she is, she... Doesn't recognize the beach she shows up at. Or the town beyond it. She beaches herself, a little annoyed by what a terrible beach this is, then starts singing again as she waits to change back to having legs again. It'll take a few minutes- Though she'll keep the shiny blue scales and lithe form for now, she's going for a sort of midform.
So she sings on the annoyingly sharp rocks of the beach, high and clear, crooning wordlessly up and down scales.