You can't give up your sword! Offer her something else.

You tell the troll you want to pay the toll, but that you were robbed by goblins and you don't have any money. You point out your lack of shoes as further proof of your story.

"That sounds like a big, heaping pile of not my problem," she says as she continues to hold your sword out of reach.

"If you want this back, and you don't have any money, then you have to give me something else, so what's it going to be?"

You're thinking about what you could give her when you notice she's starring rather intently at you.

"That's some nice armor you got there, especially with all those jewels on it."

You look down at your breastplate. It IS very nice armor and it cost you a fortune. Heck just replacing the parts the goblins stole will cost a fortune.

"I'll give you the sword back and let you cross if you give me that armor. Otherwise, I'm keeping this."