With the exception of the hemp seeds those foods don't appear high in B1/thiamine, or very nutritious.
My recommendation would be hemp seeds (for B1), cooked liver for additional protein and general "multivitamins and minerals" e.g. vitamin A, some B1, B12, iron, copper, zinc, etc; boiled and drained turnip and radish greens for vitamin C and K. As a nutritious calorie filler - boiled/roasted sweet potato (which she introduced), and maybe rice - some Japanese people just must have rice
.
That said apparently there was a prohibition on meat eating for Japanese (fish is allowed), so she might have to say the liver is for medical reasons. Might be able to get away with chicken liver.