Some great suggestions above.

leeneia, maybe if you've better access than her to internet\transport\shops(\money?) you could ask if there are any beans or other foods the lady struggles to find, then let her have a small gift "for the baby"?

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for adults but link here to " African Heritage Diet Cooking Classes" so there might be other stuff
https://oldwayspt.org/traditional-diets/african-heritage-diet?

UK NHS advice page, vegetarian babies
https://www.nhs.uk/conditions/pregnancy-and-baby/vegetarian-vegan-children/??

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"I'm in the U.S., and we don't have health visitors."
:-(
I'm glad this lady has good neighbours.