Sarah, although not physically present, was the catalyst in the Binding of Isaac to unite father and son.
In the Binding of Isaac, "the two (Abraham and Isaac) walked together" appears twice, before Isaac knew that he was the sacrifice and after.
"The two walked together" = 505 = Sarah. She was there, uniting her husband and son.
After the Binding of Isaac Sarah dies, at the age of 127 – 100 for her super-conscious crown, 20 for her intellect, and 7 for her emotions.
"Walked together" = 100, Sarah's super-conscious crown, her perfect faith and self-sacrifice in serving God.