I thought perhaps I would be able to do more to clean up this photo than I ended up being able to do. It’s almost not worth posting, but I’ll put it out there anyway.

This is Sarah Hammell. That much is pretty certain. I think the child with her is Betty McClain, but the photo is so blurry that it is hard to be entirely certain. If it is Aunt Betty, this photo must have been taken about 1920, or maybe 1921.
It’s really too bad it is so blurry. It looks like it would have been a cute photo of Great-Grandma Hammell and Aunt Betty sitting on the running board of the car.
I’m glad you posted it anyway; it would have been (as you say) a very cute picture of Great-Grandma with Aunt Betty. It is still good!