She must have had to delete a lot of negative comments about her clothing haul for her to go back, write & pin that comment. I don't imagine anybody bothered lecturing her on generalized standards of beauty; not that she's prepared to accept, (at least when it comes to herself), fairly universal standards of symmetry, proportion & certainly cleanliness & tidiness of appearance.
As to anything else, what we find personally attractive is highly variable & if she got a majority of negative reactions to her 'looks'; she might want to look again at the still she pinned.
She doesn't have the upright, confident position of someone who knows they look good in that outfit & with that makeup & styling. She's standing hunched over, (beyond what her weight demands), with a toddler-esque combination of pugnaciousness & defiance; a "MAKE me do it!" look after Dad has asked her for the 7th time to go get ready for bed.
In modelling parlance, she ain't selling that look, especially to herself.
If she isn't buying that look, why on earth would she expect anyone else to find it attractive.