At first she improves the agriculture of the village she became a head of then it escalates. She becomes involve in wars and become a trustee of Nobunaga.

Honestly, this girl is pretty OP.

Except no, she is not so average. The author used heavy-handed methods to make her more special to Nobunaga. The author had her suddenly transported to the warring states while walking on the streets. However, she conveniently had her Chuunibyo notes and books of modern knowledge with her. She has agricultural knowledge[from her farm working, fine, I can expect that], and has military knowledge[from her sister{can expect} and books[ok, maybe somewhat can expect], and from her Chuunibyo syndrome, {not really expected}, and technology knowledge from the mechanical tech tree{not expected}].

The reason I like Nohime is because she's not the obvious protector of Shizuko. Her actions screams willful noble, but by introducing Nene and Matsuo she ensures Shizuko's standing in the woman circle. Her abrupt and random visits is her way to keep shizuko from feeling lonely and to tell her there's people around her. Atleast thats how I interpret it. She's also the first and only one who let Shizuko and the readers know that she considers Shizuko as a daughter.

Of course her psychological mind games and other qualities just adds on top of that :P

The MC's older sister is also interesting, the novel never explains just how talented that sister is but indicates she might be even more terrifying than Shizuko is at the start of the Novel. The main difference between the two is probably their personalities though. I couldnt help but wonder what would happen if it was the older sister who time traveled. Tbf to Shizuko, shizuko grows immensely as the story progresses.