Did her teeth always take up that much space? It looks like the gums have receded further cause that's a fucking mouth full of teeth. Her front two teeth look like they can slide in and out of place in those new screenshots. Could the accelerated gum deterioration be from purging? I don't remember her being bulimic, iirc she simply kept a strict ana diet.
Going back a few pages
@Floralfeline has comparisons of gum recession since the 5150 and she even did her makeup differently around that time too, it was cleaner and less heavy handed. If I didn't know better (and I do know better because she films herself putting makeup on) I'd think she was hiding insecurities.