All the world's a stage.

I think Miss Brill watched a little too much Toy Story. Necklets don't cry. Although I guess this one did have eyes, which is disturbing to me.

I also think she was projecting. Right there at the end, when she's gone home and passed the baker's because she's sad, she thinks she hears something inside the box crying, but it can't be. She is projecting her sadness onto inanimate objects.

This is somewhat ironic because, from all of her Sunday people watching in the park, she seems to be something of an expert at interpreting people's reactions. She's in denial, however, about her own. It's also possible, though, that she's projecting in the other instances as well because she can never know, for sure, how the strangers in the park actually feel about things, as she never interacts with them.

On a side note, "Brille" means "glasses" in German, but I didn't see any other evidence that led me to believe Miss Brill to be German.