Living Life B'emunah

Sarah is known for her kindness, so why does Rashi, on the repeated word "shanim", stress her beauty? And if she was like a seven-year-old in beauty, why seven, when beauty peaks at twenty? Rabbi Asaf Prisman brings the Gemara in Megillah, which gives two reasons for her second name, Yiskah, that seem to pull in opposite directions. Put side by side, they say something about how Sarah lived through a hundred years of rollercoaster days, and what steadiness looks like when life keeps changing.