What about
Patricia Lorraine Gentle?
The race, age, and estimated year of death are a match. In fact, according to someone identifying herself as Patricia's oldest daughter
in another thread: "January 1st [1973] is [the date given as gone missing] because I don’t know the date," so Patricia could've gone missing closer to January 1974, when UP7144 was found.
UP7144 was found in Desert Hot Springs, which is
2.5 hours away from Redondo Beach, where Patricia went missing.
But most of all, both women are said to have had brown hair. A reddish blond wig was found near UP7144, though it's unknown if this is connected to her. However, Patricia's hair appears to be blonde in her Namus picture. Did she dye it or is this a wig?