Again we view slides from the Betty Schnabel estate. I'm guessing these were also taken by her father, Donald G. Schnabel, though I can't be sure.
These first two are of Clear Lake in Northern California. Sunrise or sunset? I don't know the lake well enough to judge from which side these were taken, but they fit nicely with the third photo.
Click on images to see them larger.
Written on this third slide is "Mother Clear Lake" and it is in the box of slides taken in Sweden in 1959. Clearly she is in the sunset of her life. I believe she was Betty's paternal grandmother, but again, it's just a guess.
Click on image to see it larger.
UPDATE: Intense Guy has kindly supplied me with the following about Donald's mother:
Donald's mother, Mary G Schnabel nee Maguire was born 20 Feb 1877 in Lima, Ohio. She married George E. Schnabel in 1897. George was born about 1876 in Ohio. If the photo was taken in 1959, she would have been about 82 years old. She died in 5 Dec 1964. She and George had about 10 children.