I've bitten the bullet and watched that part of the waffle. Firstly, she is reading the message in a really hostile tone when it is pretty much impossible to discern tone from comments, DMs, texts etc. She even says that the person sending the message said she had been through a similar weight loss jourmey and wanted Carla to succeed. So she is saying, this person is a witch and how dare she speak to me like that which is a total over reaction to what actually happened.
One slightly direct DM in a sea of gushing positive comments. The horror.