Mei asking Sara if she needed her is a question she should have asked Yuzu, the answer would have been obvious.
Oh my god YES that would have been so perfect!
"Do you need me Yuzu? - "Of course I do, more than anything" BOOM! happy ending :D
I bet the author thought about it and then was like, nah let's not.
The amount of long, drawn-out drama in this series is too damn high (╯°□°)╯︵ ┻━┻