I'd try leaving the room too. We had this happen with DD, we'd have to sit with her until she went to sleep and then sneak out stealth style. Until we started noticing it was taking hours to get her to sleep. So I started popping in and out of the room, telling her I would just be sitting on the couch and then a few minutes later go back in and give her a hug, or hold her hand for a minute. We went from that to us just saying goodnight and leaving the room (and not going back in) pretty quickly, and most nights now she's asleep within five minutes of her going to bed.