Chicken money

Hi Terry. I am 79 year old woman and I have $75,000 in Blackrock Fund TDFXX. I know it’s not FDIC insured but my Merrill Lynch guy believes it is safe. What is your opinion, please.
I also have investments, etc. with ML which give me income every month along with my social security. I am not wealthy but I’m able to live a comfortable lifestyle. My home is paid for and I drive an 11 year old car with 86,000 miles which I’m worried I’ll have to replace soon so I would use some of that chicken money if necessary.
Appreciate any advice.
Thank you,