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					Originally posted by  jgorny
					 
				 
				i think she had to end the star dance era early because of her diagnosis for lupus disease 
			
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 I'm almost sure she got the diagnosis in 2011:  
http://www.tmz.com/2011/06/12/selena...egnant-rumors/
She just had a flare up in 2013, because of the stress of the breakup, tour, partying ways with Disney and others
I think even if she doesn't sing it at the carpool karaoke it will help a bit, because people buy the first song that they find in the chart.