a possible darwin award winner ?

[Andy Clap]

I still can't get my head around this whole thing but especially why was she transferring from a petrol container into a glass jug?

I'd guess she was going to pour it from the glass jug into empty lemonade bottles or something similar, so she could then fill the petrol container again at the petrol station (and repeat until out of lemonade bottles or cash, whichever happens first).