@Headhurts I would think its simply because physical pain distracts you from the emotional pain.
@lovelessness so your sister understand she has a problem and is taking steps to stop doing it.. All you can do is be there to support her.
Sigh.. Just threaten to cut yourself if she dont stop and say “dont you care about me?!”
actually no thats just wrong.
Don’t deliver an ultimatum.
Don’t accidentally reinforce the behavior.
Don’t join in.
Talk about it.
Tell someone.
Help find more resources.
Help find alternatives to cutting.
Acknowledge her pain.
Be a good example of how to deal with things, and not cut.