Strangely, there's no real obit yet - as opposed to this tiny notice.
She died in Randolph, Vermont.
https://www.legacy.com/us/obituaries/vnews/name/ronni-solbert-obituary?id=35194674
About "The Pushcart War":
"The Pushcart War is a popular children's novel by the American writer Jean Merrill, illustrated by Ronni Solbert[1] and first published by W. R. Scott in 1964. It is Merrill's best known work.[1] The story is written in the style of a historical report
from the future, looking back at the events of a "war" that occurred a decade earlier on the streets of New York City between trucking companies and pushcart owners who use pea shooters as weapons to disrupt the trucks."
https://en.wikipedia.org/wiki/Ronni_Solbert
https://groups.google.com/g/rec.arts.books.childrens/c/aZLenFMCom0/m/BPvSZ_zgAAAJ
(birthday post from 2015, reader reviews, long booklist, and part of an interview from 2014 about the 50th anniversary of "The Pushcart War")
https://www.google.com/search?hl=en&lr=&q=ronni+solbert+&tbm=isch
(book covers)
In particular, I love "Shan's Lucky Knife"(1960), about a country boy who outwits a city-slicker con artist. It takes place in Myanmar. (Of course, in the book, the name is Burma.)
Merrill dedicated "The Superlative Horse: A Tale of Ancient China" to Solbert.
https://www.google.com/search?q=%22ronni+solbert%22&source=lnms&tbm=vid&sa=X&ved=2ahUKEwjinsSH2Nv4AhWBhYkEHXGcCvMQ_AUoA3oECAIQBQ&biw=1366&bih=649&dpr=1
(a few videos)
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