marylin stoneman took control of victim 's finances after he went into care .
she began to withdraw between £ 100 to £ 200 a day to buy scratchcards .
in total she stole £ 22,650 in the scam - the 98-year-old 's entire life savings .
stoneman , 64 , was ordered to pay back just £ 1,350 to compensate victim .