It's entirely possible that Sam came to her for a fresh set of eyes (so to speak) on an old situation. It's also possible that he missed her company, and just as possible that he was worried about her.

Possibly.

"The problem is that I'm not sure what the laws would be in our world," Sam points out, leaning forward to set his elbows on his knees, beer dangled in his fingers. "So I don't really have anything to go off of but theories. So far as I know, no hunter's ever tried to get a spirit back in."

Assuming they could get ahold of the spirit in the first place, assuming the body was still in good shape.

No hunter but Sam.