One last comment on this thread, and then I'm done
As someone else pointed out, a stamp is considered a signature. Documents can be "signed" via stamp, although it's not recommended because stamps can be stolen (I think the limited exceptions are certain tax documents which cannot be stamped by a company representative). Anyhow, if Fran said she "signed" the Playbills, guess what? She did. Stamp or pen, doesn't matter-- it counts as a signature. Maybe not the kind an autograph collector would want, but it is "signed," and her statement about it was not a lie.