Jailed : Vicky Marks stole £4,200 from vulnerable Joan Groucher while pretending to care for her . A carer stole thousands of pounds from the 90-year-old dementia victim she was supposed to be looking after finding her PIN written in her diary . Vicky Marks left her frail victim Joan Groucher 'heartbroken ' by abusing her trust to plunder £4,200 from her bank account over a seven-month period . The victim was so upset by the crime that she has had to leave her home in Croydon , south London and move into sheltered accommodation . Marks , 59 , visited Mrs Groucher twice a week and stole her bank card so she could withdraw large amounts of cash , using the code written in the elderly woman 's diary . She even stole money while Mrs Groucher was ill in hospital , Croydon Crown Court heard . Sentencing Marks to 12 months in jail , Recorder Silas Reid told her : 'The victim was in her nineties , had problems with dementia , and , effectively , you inveigled your way into her family . ' He added : 'It 's still unclear to me why you would do that to someone of that age , why you would cause her that much pain , which , in the end , was n't really for that much money . 'But time and time again you took her card and took money from her account . It seems almost every time you went to her house you would have taken money . ' Mrs Groucher , who has four children and eight grand-children , had lived at the same house for around 30 years , but she was so distressed by the crime that her dementia deteriorated and she had to move into care . 'One of the features of this case which is disturbing is that she had to leave her home , ' Mr Reid said . In a victim impact statement read to the court , Mrs Groucher said : ' I know Vicky does not have a mother , but that is no reason to do what she did . 'You were trusted by me and I 'm heartbroken . It 's disgusting what Vicky did to me . It worries me she could have done it to other people . ' Paul Fairley , prosecuting , told the court that Mrs Groucher paid Marks £10 every time she visited . The thief 's deception was found out when Mrs Groucher 's daughter Caroline Baldwin , 70 , saw that there was money missing from her bank account in July last year . Hearing : Croydon Crown Court ( above ) heard Marks even stole money while Mrs Groucher was ill in hospital . 'She noticed there was £2,000 , or £3,000 less than what there should have been , ' Mr Fairley said . Mrs Baldwin then took a closer look at her mother 's bank statement and noticed ' a pattern of sums of £100 and £200 withdrawn over a significant period of time ' , he added . She notified the police who checked CCTV footage from the Lloyd 's Bank branch in Croydon and identified Marks withdrawing £100 from the victim 's account the previous day . Marks , from Coulsdon in Surrey , was arrested and pleaded guilty to fraud at an earlier hearing . Speaking outside court today , Mrs Baldwin said her family was 'elated ' by the jail sentence , but added : 'It 's had a detrimental effect on mum - she has deteriorated badly . 'Part of that is due to her age , but every time I see her she mentions it and says , `` Why did she take it ? '' and `` How could she do that ? '' 'When I told her about the sentence it was the first time I have seen her smile for a long time . ' Mrs Baldwin said she was 'disgusted ' by Marks , whom her family had known for around five years , saying : 'If she had been handed a suspended sentence she would have done it again tomorrow . ' I think she has gotten away with it up until now , but we were n't going to let her get away with it . '
Groucher , 59 , was supposed to be caring for 90-year-old Joan Vicky Marks . But she copied her PIN and stole her bank card to withdraw thousands . Marks has been jailed for 12 months after taking advantage of her victim . Mrs Vicky Marks was so distressed she was forced to leave her home and move into sheltered accommodation .