A few days later, Sophie posted an emotional message to her mother, Minnie Sharp, thanking her for being "the rock" in their family at such a difficult time.
"She’s the toughest and sweetest and most amazing woman I or anyone else has ever met," Sophie wrote. "I love you mom and I could not get through this absolute shit situation without you."
While the comments on Sophie's post were generally full of love, some people weren't so supportive. One person said she "doesn't seem to have been very close to her father", and indicated Luke's fans were grieving more than his family.
Others criticised her use of curse words, or indicated she should be focusing on her dad rather than her mom.
Sophie didn't let the criticism slide, responding to the commenters and letting them know she's dealing with the loss of her dad in her own way.
But she also made an entirely separate Instagram post referencing the situation, thanking people for their support, and calling out those who shamed her specific grieving process.
"I am hurt and sad and crying and beside myself with what happened to my dad," she wrote. "It’s the worst thing to ever happen in my life. And I am torn the fuck up over it. But I’m not going to sit in my room and cry day in and day out until the internet has deemed it appropriate for me to do otherwise."
People loved the sentiment and commented with messages of love and support.
Here's Sophie's caption in full:
Since my dad died I have received a lot of attention online. And most of it has been positive but of course, some people just can’t be nice. And I’m here to say that I did not ask for this attention, I did not ask to be thrown into some virtual spotlight, and while I don’t mean to offend anybody, I’m also not going to cater to any one else’s needs and beliefs. I’m 18. I swear like a sailor and sometimes I dress like a hooker. And I support causes and you may not. And most importantly. I am going to laugh and smile and live my normal life. YES I am hurt and sad and crying and beside myself with what happened to my dad. It’s the worst thing to ever happen in my life. And I am torn the fuck up over it. But I’m not going to sit in my room and cry day in and day out until the internet has deemed it appropriate for me to do otherwise. And if you knew my dad you would know he wouldn't want me to. So you shouldn’t either. So to those of you shaming me for my language and my wardrobe and most disgustingly, my grieving process, do us both the favour and just unfollow. It’s a waste of both of your time.