Hi kl2009 and Welcome to the forum!
I went to a funeral a couple of years ago for a JW and acted like I had been at the KH last week. (It has been quite a few years). I am not DFd, just faded. Everyone who knows me treated me nicely. They are trying to get people like me back in. My sister, who is DFd, was treated a little more stand-offish. She was DFd decades ago.
I would do as stated above: act dignified and kind and loving. Just as you would normally. You don't have any reason to act like you are the one who is wrong, they are. Shunning is wrong. Period.
Welcome and keep coming back.