The ex-beauty pageant star alleged that Chrissy had sent them a flurry of threatening DM's on Twitter, after they married Doug Hutchison at the young age of 16.
And it appears Chrissy also took aim at Lindsay's struggles during that time.
In a since-deleted Twitter post from January 2011, she wrote: "Lindsay adds a few more slits to her wrists when she sees Emma Stone."
It came after Lindsay, 34, previously opened up about self-harming in the past.
While Lindsay has remained quiet on the matter, her mom has since spoken out.
Dina claims the 2011 tweet upset everyone in the family as she opened up to Page Six.
Lindsay's mom said: "When someone says hurtful words they’re not just hurting that person, they’re hurting their siblings, their mother their grandma.
"They’re inflicting so much pain."
Following the comments surrounding Courtney, Chrissy deactivated her Twitter due to the negativity on the social media greatly affecting her.
She also publicly apologized to the star for the tweets telling them to "kill herself."
"Not a lot of people are lucky enough to be held accountable for all their past bulls**t in front of the entire world," she began.
"I’m mortified and sad at who I used to be. I was an insecure, attention seeking troll.
"I am ashamed and completely embarrassed at my behavior but that… is nothing compared to how I made Courtney feel," the mom of two confessed.
"I have worked so hard to give you guys joy and be beloved and the feeling of letting you down is nearly unbearable, truly. These were not my only mistakes and surely won’t be my last as hard as I try but god I will try!!"
Chrissy also added that she has "tried to connect with Courtney privately" but since she "publicly fueled all this," she decided to "also publicly apologize."
"I’m so sorry, Courtney. I hope you can heal now knowing how deeply sorry I am," the TV personality went on.
"And I am so sorry I let you guys down. I will forever work on being better than I was 10 years ago, 1 year ago, 6 months ago."
Meanwhile, Courtney opened up on the bullying to The Daily Beast.
They admitted: "There have probably been five times that I've felt like I wanted to kill myself – and made the actions to go ahead and do it."
Chrissy has since returned to social media with a heartwarming snap alongside her five-year-old daughter Luna.
It came after The Sun exclusively revealed that Chrissy's kitchen items have been removed from Target's website as well as Macy’s and Bloomingdales.
Furthermore, the model was "replaced on a Netflix show” Never Have I Ever she was due to appear on.