It's her incredibly stupid hair. She needs to keep getting haircuts like this:This is probably the best picture I can find of Ashly Burch. The rest are not that great.
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She's not ugly, she just never gets haircuts that go well with her facial features. I think she's pretty, but she's also insufferable, so that removes any redeeming qualities she may have.
Edit: She honestly has the worst haircuts I've ever seen anyone have in the history of ever. Looking her up is just a goldmine of horrendous hairstyles. Good grief.