Well there were six years between the release of the films... She was only nineteen when she did ANH, and had a lot of puppy fat. I think she looks well nice in that film though, especially as she isn't encumbered by a needless bra Didn’t she do a load of coke in between making the films? That would explain a lot!
There’s only one Star Wars lass for me though—Natalie Portman. No one else even comes close to being as fit as her.