I was very sad and sorry to read this story when it broke, they looked adorable little boys. I went to school with twins who had siblings who were twins and these two sets were so close in age, the logistics of managing 4 children under 5 would be more than full on for anyone, I don't think that can be under estimated, especially as a lone parent. Having said that I never understand, when I read about houses that are smeared with excrement, maybe one of the kids took their nappy off and did that, but no matter how stressed, even if everything else went to pot, that would have to be cleaned off the wall. I didn't read how long she was out for, maybe it wasn't that long, I know Sutton, Sainsbury's is in the high street, possibly she popped out for some emergency provision, shame she didn't ask the friend to stay with the boys whilst she did that.. Nevertheless, leaving little 'uns with tea lights on a recipe for disaster, they were so young certainly they didn't have the wherewithal to know what to do. I can't help having some sympathy for her, she shouldn't have done it of course, but she's lost all her children. I was more angry with a teenage mother a couple of years ago who went on a 6 day partying spree leaving her 18 month old on her own for that duration. I remember feeling at the time, "what is it you don't understand that any sentient being cannot be left without sustenance for that long, let alone a baby, who had died in her absence.
As much as the boys in this instance died from the mother's negligence exacerbated by MH issues, I don't think prison is the right place for her.