This Is Screwed Up, but I Was Reincarnated as a GIRL in Another World! (Manga) Vol. 10

Ren has reconnected with her best friends from her time at the orphanage. She gives the fledgling adventurers the knowledge and tools they need to succeed, but she can't stop herself from meddling in their lives. Then, as she's hard at work at the forge, creating new magical swords, she invents a shockingly useful item informed by her background as a middle-aged man from our world - a single item that ends up bringing her unfathomable riches!