As Dzug2 effectively indicates, 'widows' pensions' only apply to women
under the state pension age when their husband (who was over the state pension age) died.
You would probably be entitled to a Category B pension of (currently) £110.15 per week:
http://www.ageuk.org.uk/Documents/EN-GB/Factsheets/FS19_State_Pension_fcs.pdf
Remember though that, if you've got no other income (which would take your weekly income to £145.40 or more) you'll actually get a total of £145.40 per week through the addition of Pension Guarantee Credit:
https://www.gov.uk/pension-credit