Why is everyone talking about death? Is there something I missed?
By talking about conveying her feelings when she sees Noah again, she raised a death flag. It's a common trope where someone will talk about things like going home, what they're going to do when they return, a promise they're going to keep, etc, but they never get the chance because they die. Writers do it to get a more impactful emotional response from the reader/viewer.
However, the people talking about it in this comments section are oblivious to the kind of manga this is. There have been a couple of serious things, but for the most part it's a fluffy slice of life in a fantasy setting. Mao is not going to die.