Another STRONG lead.....BINGO!.....
"Murrah Miss" is likely named for Murrah High School in Jackson, Miss....and there was a Claudia Primos that was an alum in 1968...maybe this could be the same Claudia that daylily "Claudia Long" (possibly her married name) was named for five years later, in 1973?
....I'm almost certain of it after seeing this:
Mildred had daylilies named Little Witt and Little Mimi (as well as a bunch of other "Little ______"....which could account for the other grandchildren)