From a different article, “’Based on Shep-en-Isis’ anatomical age and the style of her inner coffin, she must have been born by around 650 BC and died between 620 and 610 BC,’ Dr Michael Habicht from Flinders University told Aventuras na História.”
Even as a noble woman she would have been old for that period. “Old age was a situation that included only a very small portion of the Egyptian population. The study of the anthropological evidence from several cemeteries as well as the census declarations from Roman Egypt defined the average life expectancy for males at 22.5-25 years and for females at 35-37 years. Under these considerations, an individual in his mid-thirties was considered an old person in ancient Egypt.” https://www.asor.org/anetoday/2018/04/Getting-Old-In-Ancient+Egypt
Although Ramses lived to be over 70 ... but that was a thousand years before her.