So, about the suicide theory: It might be true because of that girl's design. You see, she dresses in a fashion style called Jirai Kei (地雷系, lit. "landmine type"), which stems from an association of this particular type of cute-yet-edgy fashion with "landmine girls" (地雷女, pronounced "Jirai-Onna") - emotionally unstable, possessive and often self-destructive women, starting a relationship with whom being likened to stepping on a landmine, hence the name.
While not all people who wear Jirai Kei are like this, works of fiction tend to depict them having the stereotypical personality I described before, some examples being Ame-chan (Needy Streamer Overload), Himeno (Hime-chan is a Needy Woman) and Takahashi Yua (Tomorrow, I'll Be Someone's Girlfriend).
This girl very clearly is made with the landmine girl stereotype in mind, meaning her bandages are likely covering up not accidental injuries, but self-harm scars (though some people who wear Jirai Kei, Yami Kawaii and similar fashion styles simply wear them for decoration, as themes of sickness and injury are common in these aesthetics, and this could be another explanation), and she MAY have actually been planning to end her life if she got rejected because of her emotional instability.
For some extra knowledge on Jirai Kei, check out the links below, and if you have any questions, feel free to ask.
https://j-fashion.fandom.com/wiki/Jirai_Kei
https://aesthetics.fandom.com/wiki/Jirai_Kei