Can I transfer money from dead parent's account?

Hi. My mother died last month after 5 years of battling cancer and she got all her retirement funds into SBI. She even opened an SCSS account recently in it. Now the problem is nobody helped us all these years and I don't want anyone knowing how much she got in retirement, not even my father. I'm the legal nominee in everything and the only sole heir. But the bank requires two witnesses who have amounts twice that mom has in SBI for some reason.

Anyway can I just transfer her savings funds through imps/UPI instead over the next month and then go to the bank to close the SCSS account? Or will they block the amount saying illegal usage of funds? Many people on reddit have mentioned it taking 6 months to 3-4 years to get their parents money out even with nomination. That's a huge headache for me.