some sort of manual I could give her that explains life in the UK
I'm struggling to understand this to be honest. Surely domestic life in the UK is the same as life in Poland, isn't it? Or are you saying that Polish families "wander off, leaving a full pan of chips on the stove"? And do Polish familes not do "basic safety"? Are they all reckless with the safety of their homes and children? And if she's managed to run a household successfully for the past 5 years, why is she only now making life threatening mistakes? If this is a genuine enquiry, it doesn't seem to me that the problem is just a lack of understanding English which doesn't seem to have much bearing on the problem anyway. 