Now looking back the solution was simple. Just took me a while to figure it out.
Nothing complex, just a chain and link.
I had thought about buying her a brooch converter, but paying that much for one piece that will get lost at least once....
Here is a pin on the link:
And here is the pin hanging on the link. It does hand straight, but hard to take picture one handed.
I have a couple more projects that I have managed to photograph, will update in the next few days.