Monika's currently a coward, so the archetypal story arc for her would be finding her courage and saving everyone, maybe giving up her life in the process.

She also cares a little too much about her life, so if she knows someone has a Grief Seed and she's gaining in despair, she might attack first. This would lead to more despair, and a darker end.

I'm not going to aim for either of those, though. I'm just going to go along with whatever maybe possibly happens to her~ If I think of an arc, I'll do that later~