I am not blaming her death on their financial circumstances, or even on their lack of responsibility, in that they had her allegedly sleeping on the sofa as there were too few bedrooms for them all, which may have lead to her spending more and more time with her G'ma and her unsavoury partner - and that if I were TS parent, I would have given up my own room for her to sleep in.
The blame lies squarely with the perpetrator of the crime.
But by saying:
Perhaps if they had lived within their means and had only had the amount of children they could actually look after or afford/ house appropriately then poor TS would not be lying on a slab in a mortuary right now.
You are suggesting that TS's death is as a result of the circumstances they created. If you do believe that the blame lies with the perpetrator, as you say above, you might want to more careful with the way you word things.