You could get her a friend now, and put them in adjacent cages or pens. That way they can start getting to know each other, but no-one gets hurt.As soon as I can get the “scratching until she bleeds” then I will get her a friend. As you know blood is a no-go with multiple birds.
Look-no-touch for days or weeks is a common way to begin introducing chickens, and it's safe to do even if one has blood on her because of the no-touch part.
And if her scratching is caused by loneliness or boredom, having a new chicken nearby might help her quit doing it.