I stumbled upon vaporwave and dark academia around the same time . . .2016-ish, I think.
Aesthetics as a whole have had a mixed impact on my life. I wouldn't quite call them life-changing; they're just another thing that I'm interested in. Some - mainly dark academia - have had a negative impact on my life. Others have introduced me to different media/music/styles/etc.
On top of what people have already suggested, I'd take a look at Naturecore and Butterfly. There are also some similarities to Adventurecore and Bloomcore.
Sounds a bit like Science Academia.
I'd also recommend that your friend reads the article on finding one's aesthetic if she wants a better idea of what her aesthetics are.
Also - remember that not everybody has to have their own aesthetic, and that people don't fit cleanly into single aesthetics. Rather, people tend to be a mix of different aesthetics.
I've seen people call some of these images Indie Kid.
Here are some lighter aesthetics that say they're related to Goblincore (in terms of hoarding things): Pigeoncore, Fairycore, Miniaturecore, and Pixiecore.
You might also have luck looking at related aesthetics on their Wiki pages.
Anime, Spacecore, Adventurecore, or Art Hoe might have what you're looking for.
I would also look at Academia aesthetics - in particular, Science, Classic, and Art might be up your alley.
Also - gender, sexuality, and zodiac signs aren't really useful for finding aesthetics. Your aesthetic is mostly based off what you like, are interested in, or 'vibe' with.
I don't think there's a specific aesthetic that can represent a single age, since aesthetics tend to be based off of fashion, philosophy, interests (etc.). And those vary. They don't align themselves with a single age, they just . . . are.
Fearofdolls (Fearof___, where ___ is another noun. Or verb. )
I'd suggest just playing around with adding different words/phrases to 'Fear' or 'Sad' and seeing what works for you. An aesthetic username is a bit subjective (meaning that not everyone will look at a username and think it's aesthetic . . . it's really just up to you to decide if it's aesthetic or not).
Too many. Right now, I think that Cybergoth looks really cool. I'm also partial to Synthwave, Cyberpunk, Voidpunk, and Mori Kei.
I've gone on various internet-rabbit holes and discovered different aesthetics that I like. I think that exploring the Wiki is a pretty good starting point . . . clicking on random pages, scrolling around, seeing what pops up / catches your eye.
I'd suggest searching different things that you like on the Wiki and seeing if anybody's put them down on an aesthetic page.
Also, you don't have to have an aesthetic (or just one aesthetic! I have plenty...). Most people are a mix of aesthetics and don't fit neatly into one box.
From your Pinterest board: Pastel, Kawaii, YumeKawaii, Softie, and Sanriocore.
Adding -core to the name of a country is bad form . . . is there something in particular that you're looking for?
I know that there are several aesthetics on here (most of the Kei suffix, for example) that are based in / from Japan, if that helps. Kawaii and Anime might also have what you're looking for. (City pop?)
I'd look at Fairycore, Sanriocore, Babycore, Angelic, Pastel, and Softie.
Xollan (love the name) sounds a bit Voidpunk, depending on how xe feels about gender.
The presence of a syringe on Wilt is very Medicalcore.
Abby . . . both Mushroomcore and Bloomcore are things (based off of the emojis used).
For some reason, Icepunk and Ocean Grunge come to mind. Might not be exactly what you're looking for, though.