Parents made dropbox appointment for B2 visa. But father expired. What should I do so my mother can attend the interview alone?

My parents made a US Visa appointment for B2 visa many months ago. The original DS160 for renewing their expiring B2 visa submitted was a family application (with my father’s info/form filled first, then my mother’s). 2 visa fees were paid for the processing.

Their dropbox appointment is coming up in a week. But my father passed away last week. Do I need to make any changes so my mother can attend the existing appointment? Is it even possible to keep the existing appointment for my mother?

If you’ve experienced anything similar, can you please let me know how you handled the situation? Any advice/thoughts are appreciated.