Re: Maybe she had to.
You're probably closer to the truth than you imagine. I remember seeing an interview where she mentioned she'd signed over the rights to her likeness over to Lucasfilm. She joked that every time she looks in the mirror, she has to send George a cheque for 5 dollars. Then you had the revelation that David Prowse never received a salary for ROTJ because due to creative accounting, the film never made a profit. I live in the same street as Kenny Baker. His humble abode certainly isn't that of what you would associate with someone credited as an actor in what at one point was the 3 highest grossing films ever made. Lucas stuffed the lot of them* IMHO.