Small spoiler from new upcoming chapter 18 of Bride of Sanemi...
"So the reason I'm so fast... so strong it's because of her... not by my own power....?"
"My child, I sense a power in your heart that could even be as strong as the Stone Hashira's. If you use your ninja and demon slaying abilities to the best and learn how to fully control them and your Music breathing technique, you could be the strongest one here. All of that isn't just on miss Kocho, it's you too."
"I can be as strong as Mr. Himejima....?"
"You can be stronger. She was an excellent swordsman and absolutely exceptional in medicine, technique and speed. With her talents being similar to yours I can only imagine how strong you must be when you channel her spirit and combine her strengths in yours. Have you ever done that?"
Hannayome was stunned, as she didn't realize she could do anything like that. "N-no... I don't think I have."
"I see, maybe we can figure it out together.