As Sal said, the young are open to the things we people who've been here longer can no longer see...
don't discount it...she sees something...ask her to draw a picture...don't act fearful...just inquisitive.
When my DD was around 4, I was tucking her in for sleep one night. I was telling her how much I loved her, etc.
Suddenly, she grabbed my arm, and said in a very mature, matter-of-fact voice,
"I was your mother..."
She'd never used the term "mother" before.
I asked her, What did you say?" she repeated it, in the same tone.
Okay... she has had many instances of acting like my mom over the years...my mom died when I was 20 and pregnant with her older brother...

I don't question the wisdom of the young ones...she no longer remembers this...but I do They're in touch with the other side until they get "indoctrinated" by the material world...