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.
this would prob be a boost for women cuz she will be adopted to someone very influential and show as a highly intelligent woman who improved many things and is innovation full, therefore displaying that women can be of high intellect and value. maybe idk