Our 7 year old niece put my 2 year old into the garage unsupervised and then..

I was outside packing up the car, my wife was busy in the kitchen, grandma was watching our youngest so my son and niece were just around the house within eyeshot of us for the most part.

My niece likely noticed my son hovering by the garage door, decided to open the garage door to lure him into the garage, then close the door on him and rush back inside saying "where is \[son\]?". Grandma and Wife hear him in the distance but can't figure out where he is, so they start freaking out and panicking. I'm in the driveway and hear the door open and hear my son, but I'm in no rush to get to him because I assume he came outside with an adult and he's fine, so I continue to take my time putting something into the car and walk back to the garage where I find my son barefoot and by himself in the garage. When I get back into the house I hear my wife freaking out, so I tell her he's with me and my niece immediately tells me that the garage door was half open and she saw him walk out of it.

Two things:

1) The garage door does not stay open because it is weighted and always shuts (I immediately verified this). It seems likely my niece is the one who opened it and lead him into the garage and shut the door on him (although we don't know for sure).

2) Also, if my niece truly saw this, then she withheld this piece of information and watched my wife freak out trying to find our son.

Anyway, I don't think I'm really looking for advice here. I think I needed to vent and maybe some validation that this is insane behavior? Honestly, this is repeated behavior from my niece, this just happened to be the one time she went far with it and briefly got away with it.