1. 'With' doesn't work in this context.You could be distraught 'with' grief for example, but since we're talking about the source of her distress, we say distraught 'over'.
2. It means that people suspect she committed suicide, but it hasn't officially been confirmed as a suicide yet.
3. Hours after she sent the text message, she committed suicide. She sent a text, then waited a few hours before killing herself.
Student or Learner