(Hoping I can post this link, it's a gov't site pdf document. I tried to look for the specific guidelines and think this is ok)

Leaving children home alone in Australia

I hope that helps.

FWIW, I, personally, would definitely not be leaving a 2 year old at home alone for any reason. Dealing with a bad mood is way preferable to them waking and you not being there, or any of the other myriad of horrid things which could happen in the 10 mins you aren't home with her.