Executive producer Julie Plec tells TV Guide that issue will be dealt with right away when TVD returns from hiatus with Season 4, Episode 16, “Bring It On” on March 14. “[T]he question of 'How does she really feel?' and 'At what point are we going to know?' is still very vivid and front and center; they certainly have plenty of screen time together,” Julie explains.
“But it is very humbling for Damon, who is more used to the love and adoration he's been given from this girl, sire bond or no sire bond, this season and now she's like, ‘eh.’ So it's both entertaining and tragic all at the same time,” she adds. (Suffering and tragedy for Damon? Why that’s all part of the TVD writers’ ingenious scheme...)
Obviously this doesn’t answer the question of how much of Elena’s feelings for Damon are dictated by the sire bond. If turning off her emotions switches everything into neutral, then it overrides her eagerness to please Damon and follow his instructions.
If that’s the case, then it won’t be nearly as easy for the elder Salvatore to tell Elena to turn her emotions back on. No-emotions Elena may be around for a while.... Source: TV Guide