Did she? Those signs may only become signs once they're re-contextualised by her suicide. Friends and family often say they never saw the suicide coming, but they're still with feelings of regret all the same.
So this comic leaves me with mixed feelings, we're given no information on what the FMC could have done for the girl besides been there at that particular time, and could she have actually known? Was it actually feasibly possible for her to have been there?
To me it feels like this should have been framed a bit differently, and been more about how the friend didn't intend to have such a negative effect on FMC's life.
But maybe I'm overthinking it because it's a heavy subject.