Could try one of the little chains found on the catch of a bracelet or similar. She might not even notice it's missing and think it caught on something and fell off.Christ I keep forgetting it's a bubby one. I'll have a think and ask T'wife, jewelry is normally a good source. I've used that sort of chain on a 72 scale Sherman many years ago and it didn't look quite right. But in the early 80s most modelers weren't that pedantic.