The ultimate proof that Sakura loves Naruto like a brother was when she told him 'i love you" so Naruto would stop chasing Sasuke. I sincerely don't see how Naruto could continue liking her after that.
She was just despicable. And yes, she loves Naruto, but only like a bro.
She does not love him. Did she confess her love ? No. Why you guys think Sakura deserved Naruto? She has feeling for him as brother and very good friend.
Love.
But not soul partner...
She touch inside his heart, kiss him (first kiss!!)
Madara may kill Sakura and Obito, because Madara do not like to lose.
(When Madara want to 'play' with Gai, but when Gai wounded him, he sent the black 'ball' at Gai. Sore Loser).
Possible Sakura could have 'die' temporary.
Theory
Then Sage brother could 'transmigrate' to her to give her The Byakugan Eyes Power.
When Tsunade healed Lee, she could visualize Lee's body injuring.
As Tsunade told Orochimaru that she cannot die in fighting.
Sakura also had that moment when Sasori pierce her.
Notice that both Sasuke & Naruto had both "die" temporary.
This will enable The Sage could 'talk' to both of them together.
Missing parts;
Sage did not mentioned about byakugan eyes, for it could be inherit by Sage brother.
If Sakura have the byakugan eyes, plus her strong medical skill,
she may provide back support to both Sasuke & Naruto.
This will counter any attack by Madara, as Madara wanted to be like Sage Mother, Kaguya, power.