beverley davis was supposed to be helping to care for 89-year-old former royal marine ray warren .
her actions left elderly mr warren so devastated that he lay in bed at night worrying about money and even stopped going out .
the 35-year-old mother-of-three used ray warren 's bank cards to buy chinese takeaways , pay for creche fees and even clear some of her mortgage arrears after she gained his trust while working as a carer in his home .