WTBH, being amused is a totally natural response. It's kind of like how you feel when a 2 YO is throwing a tantrum. Good for you.
I think my next big step was I accepted that this was simply her nature. It's what she does. From seeing her this way I could move beyond wondering why it happens and realize it Wasn't mean or evil. It was simply her nature. Just like a scorpion, there is any need to wonder why they sting, it's just what they do. Knowing that it is a lot easier to avoid being stung.
So keep smiling, it is a good sign of recovery.
Your friend,