Why do you think Jeannie May Crawford sold Carla Boone into slavery?

she wanted Boone all to herself, no joking caps probably

Because she couldn't stand the fact that Carla thought she was too good for Novac.

I actually got the feeling it was Manny who wanted Boone to himself. By the way, are we supposed to assume that Manny and Chris Haversam are lovers? I noticed when I went back to Novac after Come Fly With Me that they seemed to be sharing a motel room.

This is not about Manny and Chris.

Partly this, and partly because she thought Carla would have convinced Boone to move away.