Yes.
And you don’t see anything odd about her being the only one who doesn’t look like she really belongs, she’s not standing in the same pose the other girls are holding? She’s not in the other group images with the girls who are supposed to be her classmates?
Mercer Island High School opened in 1956, we know that because Nancy Ramey, the Olympian was a Class of 1958 girl who attended Mercer in 1956.
Nancy was born in 1940, the Class of 1960 girls were born in 1942.
Maxine Box, who is shown in a composite image also graduated in 1960, the groups show Maxine in several grades, where was Stanley Ann Dunham?