About the previously long talk about Shizuko's actions and all that stuffs..... it's an old conversations so I won't notify them directly, but here's some stuffs I want to get out of my sustem.
Agriculture is military-related stuffs. More food means more supply for the troops and better growth rate, the latter could be used for making more armies in the future.
Shizuko can technically just send enough rice for them (which would probably be reported by the army that's watching her), but since the size for old rice bag is different than what she knows, this would still make Nobunaga come to her.
Crossbow is also necessary for her, and while it's not technically new (just like guns in broader term, mind you) they will still increase Oda's military force with how easy they are to use and learn compared to normal bow. Their fire rate per person might be lower, but that doesn't mean much if the size of the army is bigger.
You could argue that helping mass-produce gunpowder is a bad idea I guess, but she seems to be resolved on helping the Oda (even without personal reason, they're probably one of the few countries that would let her be someone ranked this high. Plus, she's an Oda clan's advisor now so she'll probably be killed when they lose.