$25k per copy, by my reckoning. I mean, seriously, if it flies in court for them, why not for her? She should/could push for ten figures of punitive damages.
I don't think the MPAA gets punitive damages except for willful infringement. It's going to be hard to prove that this case with Disney -- it may be that nobody in Disney's employ even knows that this image is someone else's, if the work was done on contract. And it's going to be hard to make the case of economic harm, since the artist was not selling her work in the market otherwise.
Wouldn't the same logic follow though if someone agreed to turn off their file sharing and/or delete the files they downloaded? The MPAA/RIAA doesn't seem to be ok with that.