She doesn't take the offer.

Padme stares at the collar in the droid's metal hand; even though it is outlawed long ago, she instantly knew its capabilities. The moment she put it on, she would be placed in **** pain for even thinking about disobeying any order given to her. Despite the risks and much to her own surprise, she actually considered taking the offer for a moment. But then she remembers that the Republic knows she was on this planet as should be here within a week and a half. If she left the planet, there was no way she could tell the Republic where she was going, and there is a war going on; the Republic can't waste resources searching the galaxy for an individual senator.

So Padme pushed the collar away, "sorry, but no, the Republic will eventually come for me, and the moment I put that on, I will no longer be able to act on my own. "

The droid picks up the collar "as you wish, senator." Before stumping off. With each metallic clink of its feet, Senator Padme wondered if she had just traded slavery to the slavers for something worse to Jabba.

Jabba's treatment of her changed from that moment. Yes, she was still considered Jabba's personal ****; thus, her cost is too high for anyone to buy time with her. However, before this point, Jabba would limit where he placed his tongue to her calf and shoulder, and he would only do it when people were watching. It was almost as if that was his way of convincing everyone that 'she mine.' However, after this moment, his tongue became much more adventurous on her body.

The first time his tongue slipped under her the rope of her bra strap, she tried to jump away, but the chain taught, preventing her movements and holding her close.

That night the protocol droid woke her up "excuse me miss senator. I can assure you that your identity was safe with the members of Jabba's pleasure barge; however, Jabba keeps a much more loose and open company here at his palace. We can not promise that any of those members won't sell your identity to the separatist. Many of his visitors have very keen eyes, and even the slightest movement will be noticed, so I must ask you not to do anything that might give away your identity again like you did today." The cold piece of metal promptly turned and walked away without giving her a chance to speak.