Depends on if she would endorse Hillary after the primaries or not..
I think if she endorsed Hillary she would have Palin on, those kind of ratings you just couldn't pass up. But then again, if she did not allow Palin on, it would not be seen in a similar light as it is now, since Obama is black and Hillary is white the race issue would not exist.
Depends how faithful she is to the dem. party. I do think she would have Palin on if Hillary was elected