I've heard both things but mostly on the nice side. Like even people saying she would offer cold water when they were working on the street in her neighborhood.
I think it depends on the situation and her mood. Unless a celebrity is a real prick, and consistently, I think we should all keep in mind that they are like regular people who can be in a bad mood and not keep it cool or not like certain situations (I imagine a lot of celebrities don't like signing stuff for hordes of obvious ebay sellers for instance)
Debra Winger has a reputation for being difficult to work with, but that doesn't mean she's "not nice", specially with fans (since her reputation is within Hollywood). It's also been some time since she had that reputation.
It's just that she would probably refuse to have her face licensed for Wonder Girl (purely speculation of course). It could also be a pain in the ass for DC to license other characters from the show, although the series was produced by Warner. Or they just think it wouldn't sell, after all we had almost nothing of Lynda Carter as Wonder Woman herself until the reinterest surrounding the film.
Anyway, back to the statues. I'd like a 70s Diana Prince very much. Specially 3rd Season style when she was a fashionista.
