I have several pink/salmon bunches and also one that is more of a peachy color. They both came from the mountains with the ditchlilies and the Kwansos, and in all these years I've never seen any natural hybridization going on with any of my daylilies. So honestly, Annie, I just don't know. But I'd isolate it just as you are doing. It will form a clump of its own.
I am so out of room for more gardens plus the fact is that I can't just jump up and dig a hole on a whim, so I'm not letting myself get more daylilies, even though I love the ruffles and adore the sculpts and drool over some of the spiders. The hybrids are so beautiful, but then so are my old, well loved, and long cared for plain old daylilies.