"Weeb" and "chan user" are not personality traits. You could probably very well talk to her while simply keeping quiet about either of those and she wouldn't notice. The language barrier's already enough. If your character is entirely based on being those two things, you might want to reevaluate your life.
In regards to the chan thing, though, you could make the argument that chans perpetuate a certain culture, a way of thinking and speaking, that she dislikes, but you gotta keep in mind that she's Japanese and probably thinking of Futaba and the like, eventually 4chan, judging from a couple of her more politically coloured blog posts (which are all just jokes about Hitler looking かわいい anyway). If using chans has influenced you to your core, being on Uboa and making coherent posts about your feelings and all that gay shit should at least be some kind of confirmation that you're not too far gone to talk to her (since all she does is talk about her feelings). Smaller places like this one tend to have a somewhat different culture, after all. I definitely know that I feel completely alienated if I ever think of posting on 4chan, and the same goes for Uboa's discord where most of that crowd seems to gather, even though I'm perfectly fine with posting here.
However, I entirely agree with what you said about arrested development. The difference between her and ""us"" (whoever that mystical conglomeration might be) is her apparent childishness and naivete. Her expectations of an entirely inhuman being who will devote its existence to her needs - people here have said that they wish for such a thing, but I'm pretty sure all of them ackknowledge that it's impossible and drudgingly accept it. She switches between despising reality for it, to despising herself, which is something some people here might have in common. She's aware of her flaws, she's made posts about hating herself, her looks, her anxiety, her helplessness… But since she doesn't seem to be able to do much for herself (well, she's started to help her mom with cooking or something), the only realistic way for her to find a person she can become closer to is lowering her standards and accepting these same flaws in other people as well. Judging from her posts though, she just seems too self absorbed to ever figure that out. Odd, you'd think such experiences would at least make a person morePost too long. Click here to view the full text.