Okay, I think my eyes are messed up. To me SSS51 looks pink, not peach. But I also have/had daylilies that were registered as orange or peach that were obviously pink to me (Fiji for example). I know colors can change with environmental differences but I wouldn't have thought they'd change that much! I can also have a problem telling apart lavender and pink sometimes.
From your chart it looks to me like Ruffles Have Ripples and Blue Eden are pinkish so that could be where the color comes from. I really like it and hope the eye starts to form a pattern!
I'm guessing SSS48 takes after the parent(s) of Journey of Magic (especially with the lighter ruffled edge instead of the dark purple one). But to me the color looks very similar to Lavender Blue Baby.
If I ever get a cross to bloom where I know the parents/grandparents/great-grandparents I'll have to make a pedigree chart too! Mine won't look anywhere near as nice as yours but they really are helpful.
