Sarah Lincoln Grigsby

[Gene C]

I was disappointed when I read this article about Abraham Lincoln's sister on the web site of the Sagamore Institute.
https://sagamoreinstitute.org/sarah-lincoln-grigsby/

There seemed to me too many false or misleading items in the article.

- There is an unidentified picture of a young women, and it's the only picture in the article. I've seen it before, but can't remember who it is. It's not Lincoln's sister.
- Sarah was only 20 when she died, not 30.
- I can't recall previously reading a source that mentioned "Eleven-year-old Sarah Lincoln took on the education of her younger brother and future president, Abraham, following the death of their mother..." and
- "Sarah’s dedication to teaching her brother to read enabled him to gain a law degree and accelerate his ascent in politics."

I may be mistaken, but does anyone know of a credible source for that statement?
Am I being to critical on all of this?