Even though it's an edit and she doesn't actually call Amber a shitty person in the clip, Chantal really has made multiple now-deleted videos directly attacking ALR, calling her a bad person, manipulator and YouTube's biggest liar. I have great difficulty believing Chantal and ALR can ever become true friends after Chantal revealed her uncensored feelings towards her in those videos. It seems like Chantal only wants to be associated with ALR because she's the only person more massively super morbidly obese than her.
The drama between them started from Chantal filming a McDonald's mukbang last summer where a homeless man came up to her window to ask for something. Chantal then claimed on video she went through the drive-through again to get a meal for the homeless guy, when in reality her car not moving an inch proved it was a lie. After people started noticing, ALR tweeted something like "Can you believe this YouTuber we all know just blatantly lied to her audience? You can literally see the proof right in front of your eyes!" Chantal got super pissed off about the tweets and made two heated rant videos directly attacking ALR. This Katie W edit has some clips of the rants, ones where Chantal is wearing black and has a pissed tone of voice:
https://youtu.be/D0eiiidAMfk?t=96