I wasn't at the Paley Center but I was told that Alexandra did sign for a few people before security put a stop to it. She is, or at least was, willing to sign through the mail. I sent her a photo with a SASE. She signed it and personalized it to me. This was back in the 1990's and there was an Isles listing in the NYC phone book. Other people used the address and had similar success. I don't know if she still signs through the mail or if the NYC address is still valid.