I have an amazon dash button (it amused me to have a button to order loo roll); and yes guests who use the facilities push the button for sh#ts and giggles (pun intended). But each time they do it pops up on my phone saying "Giant box of andrex on its way" (or something like that); so I just hit the "woops didn't mean to do that button" and the order never gets placed.
You also get emails for every amazon order you make within seconds; if you have an Amazon Echo in the house I am sure you also have a smart phone that picks up your emails. Are the parents of this little (very smart) girl claiming they didn't get the email and didn't think to cancel the order?
Me thinks that someone might just be after a quick 5 minutes of fame.
As for how well all these things work; if only my Google Phone and Watch could realise I don't want them both to 'OK Google' at the same time!
--Beer icon for when I can say "ok google drive my self driving car to the pub and get me a pint of what ever guest ale they have today; and on the way back can you find the deliveroo guy with my curry and give him a lift. Also record it all in the intake screen on my fitbit app please".