Yeah she's getting up there in age, I wouldn't be surprised at all if she ignores fan mail.
I think I'll give it a shot though, the worst that could happen is not receiving anything back at all.

She is 97, so im not sure if she goes through her fan mail. You can always try once you get the addy.

I'm collecting classic actresses at the moment, Zsa Zsa is one of my favorites...
Her health has been on the decline, she doesn't leave her house from what I hear...
Does she still sign? Would it even be worth trying? I noticed that she's not in the database but I found her address on a different celebrity board... I would love to have her in my collection...