Just basing off the quality, she could also have switched back to using her camera instead of her phone. She's mentioned that one of them makes her seem less round, although I can't remember where or which.I thought that she might have actually lost some weight too but I went back and watched some of her older videos and now I'm torn. I think her face looks slimmer because of camera placement and video editing. Her camera seems to be positioned down lower and aimed up as opposed to being near eye level. The change in perspective probably softens the face wings and gives the illusion of a neck.