My parents left me for a weekend with a friend at home when I was that age HOWEVER my dad was the local cop in a one man police station so I had the eyes of the town on me anyways

In Melbourne, nup I wouldnt leave her either - and I agree see if she can stay with a friends - I wouldnt take the keys off her (but think up a trap so you would know if she has been home - one that 16yo don't think we are smart enough to know - like, leaving the toilet seat up - automatically put it down and prob dont think to put it back up again hehehehe)

have a great time most of all!