What’s the context and age? Does she laugh at your jokes more than with other people’s jokes? Really it’s hard to know because you need to first establish the person’s baseline.

Like for example whoever suggested the hair behind the ear thing, it could be, but it also could be that they do that too often. I’m one of these too oftens for hair behind the ear and I tend to gesture more at my ears too because I can’t always hear perfectly.

So, yeah there’s a hundred tell tale signs but you first need to have something to compare them to.