You may also get Carer’s Allowance (or Carer’s Credits) if you look after her for at least 35 hours a week and earn less than £123 per week after Tax, National Insurance and Expenses. Some benefits are classed as overlapping benefits, which would stop you getting Carrer’s Allowance, however you could still get Carer’s Credits towards your pension, if you look after her for 20 hours a week.
I know you could be pension age, yourself, going by your mothers age, however the information may help someone, if they do not already know about benefits.