What should I do to get a childhood toy back?

A long time ago, my grandmother gave me a wind-up ballerina toy that I would always play with when I went to her house. I asked her to keep it for me because I didn’t want anything to happen to it. One day, I noticed it was gone from her display cabinet. I found out that she’d forgotten that she’d given it to me and told my cousin she could have it. It was a sucky situation for awhile, but now I’m worried that she’s going to give it away or break it.

I’m not close enough with her to ask her for it back. Maybe I’m a chicken, but I think there’s easier ways to get it back. My aunt and uncle, my parents, and my grandmother know that it was mine to start with. I have next to no toys left from my childhood and it means a lot to me.

We’ve been in this situation before where things have been passed down and she didn’t take anything, so I doubt her connection to the toy. What action should I take to get it back?