If I remember my fantasy/folklore well enough, pretty sure there are a number of possible evolutions that can stem from a simple goblin, a number of which are almost indistinguishable from other demi-human races (brownies, high goblins, and other such faekin races). Implying she's not still a type of goblin just because she looks more human is pretty ignorant. Heck, pretty sure the redcap evolution they were shooting for isn't very goblin-like also.
I can't speak for folklore redcaps, but in JRPGs/manga, redcaps are almost always depicted as just goblins with red caps, essentially being the "monster, but elite/palette-swapped version" video game trope (vs a more different-looking evolved type). Saying it's "ignorant" to say she's not a goblin anymore because of folklore comes across as a bit ridiculous to me since there's zero reason to believe they're doing this for folklore accuracy purposes vs just because they wanted a kawaii moeblob (brownies also look nothing like this).
There's a longstrip comic that's basically the same situation: It's about a MC who's a goblin, and has a goblin sister, and who saves a goblin slave who's the third MC. They're all "goblins" with white/fair skin, just a few green scales on their face to show the reader they're not 100% human. The rest of the side-character goblins, even the ultra-powerful heroic goblins from the past he can summon, all have green skin. It's not a matter of lore accuracy, it's a matter of authors not thinking they can keep people actually looking even slightly goblinesque and have readers like them as much.
One of the better that don't just erase the premise or makes everything super easy is the one with
the plague dragon. The promised evolution a bunch of chapters back made it
worse.
Yeah, I really like this one, shame about the update rate. It does have a bit about him trying to become human fwiw, but at least by this point it was shown how horrible those attempts failed, vs being a "disregard the premise" button.