She just commented on Elle's post about her youtube video on her Mum "You got this. All our love, the Carters". To say they are supposed to be super close family her responses on Elle's post dont always strike me as the most natural sisterly response to a grieving close family member. I think Lucy is quite an emotionless person who only carers about her image and herself, ive noticed she doesnt comment on the other sisters posts just Elle's where more people are likely to see it
I doubt Lucy even bothered to watch the video to be honest!