Nps contribution in the year of retirement?

My mother got ana NPS plan last year (financial year 2015-2016) and invested Rs 50,000 in it to ge the deduction. He turned 58 in October 2016 and retired (Haryana govt, retirement age is 58).

So her this year's income is from salary till october plus pension from november. I want to know that can she invest Rs 50,000 this year to get tax benefit (above 80c). Also, then can she withdraw the amount next year as the corpus will be less than 2,00,000.

Thanks in advance for any help!