IzuchiUchiha6
Here's the beginning of a story based on your hints:
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Title: Hidden Petals of the Uchiha
Disclaimer: This is a fan-made story. All characters from Boruto: Naruto Next Generations belong to Masashi Kishimoto. This is a Boruto x Jiya fanfiction.
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Most people knew of Sarada Uchiha-the pride of the Uchiha legacy. Talented. Sharp. A future Hokage candidate.
But no one knew Jiya.
Born just minutes before Sarada, Jiya was hidden away. Weak, with no Sharingan and no chakra talent to boast. Sakura made the impossible decision to hide her second daughter, afraid that Sasuke, already distant, would abandon her completely if he knew.
Jiya grew up in the shadows. No bedroom. No toys. Her world was the rooftop under the stars or the cold storage room behind the clinic. While Sarada was trained by legends, Jiya taught herself to stay silent, unnoticed, unseen.
She saw Boruto from afar-loud, kind, full of dreams. Even when he looked past her, even when he smiled only at Sarada, Jiya couldn't help but admire him.
Boruto, of course, had eyes only for Sarada. Since childhood, he'd followed her like a stubborn flame chasing the wind. He barely noticed Sarada's quiet "twin"-a girl so hidden that most thought she was just a helper, or even a rumor.
Sasuke never looked at Jiya. He didn't know. And Sakura, carrying guilt deeper than her medical ninjutsu, never had the strength to tell him.
Sarada saw Jiya as a bother. A shadow that always trailed too close. "Why are you always around?" she once snapped, not knowing they shared the same blood.
But Jiya never hated her. Even when she cried alone on the rooftop at night, she reminded herself:
"She doesn't know. No one knows. I'm just... invisible."