It wouldn't actually surprise me if Sun was working for Ben. He's already got Sayid working for him, and since at the end of the episode Ben said to Jack that he had "a couple of ideas" for how to get them all back to the island despite Sun blaming Jack for Jin's death, I'm thinking that he's already got most of them onside.
I agree, Sun's character is alot more interesting now. Good point about the money, we know Ben isn't exactly short of cash so it's not too far-fetched to assume he gave some to Sun, especially if it helps her to go "undercover" and make a contact of Widmore.
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