Retirement benefits amount received on behalf of of husband (deceased)

One of my client received a amount of RS 15 lakh ( including ELS. gratuity and other) on behalf of his husband Who died few month before.She also received a pension .now my question is. the above amount she received is taxable are exempted? total 15 lakhs amount was credited in her pan and tds also deducted which clearly reflected in 26 as. so please help me to find right solution .is total leave encasement amount is exempted are not (ELS amount was RS 8 lakh. remaining amount belongs to gratuity) (Deceased person had worked in KPTCL which i come under purely state govt )