Im trying to recall what was discussed in my Public Relations class back in college, and I think it is not an issue with celebrities because they have "put themselves in the public arena" so to speak, and are fair game. The point of being a celebrity is that your picture is everywhere. Im not sure though, you may be right. I think a private individual, who has not put themselves in the public arena like a politician or actor/actress, is due compensation for use of their likeness. Like I said, I may be off. It will be interesting to see, that is, if this reaches court.
Even though she wouldnt accept (I suspect) it would be wonderful for them to actually submit the offer to her and get her reaction.