I've caught up, and would like to take a moment to try and explain Saaya's take on Amu a bit more, since I'm not entirely sure the right read on it has been taken.
Saaya, out of everyone in the class, seems to have developed some level of
resistance to Amu's passive mind control aura.
(Likely due to being hit with every canon type of mental alteration there is, I mentioned this in an earlier write in. she was X-Egged, X-Character'd, Mystery Character'd, and IIRC also hit with Utau's song. Oh, and she's been dealing with Amu's passive mind control hammering her every school day for multiple years at this point.)
This is the aura that ensures Amu is, well.
Liked. That maintains the 'cool and spicy' impression everyone has despite her own admittance that she has spent basically zero time socialising within her own class all year.
Class had just ended, and Amu looked up from her desk and found herself staring at a class full of people who barely knew her name. Or, no. They knew her: As 'Amu, former student council member'. Or 'Amu, cool and spicy semi-delinquent', which was Kukai's joke, not hers.
The aura that lets Amu get away with magical-girl'ing all grade school, that makes her just popular by default.
Saaya remembers that she floated
and that that was weird.
She on some level knows about all of Amu's Charas and their abilities from her Mystery Transformation into Himamori Dream, under Lulu's mind fuckery with her Egg.
Which means she knows about Rans physical boosts pushing her to the top of class and far beyond, Miki's 'auto-skill' aspects ensuring she has top marks, and Su's blatant mind control meaning she never has to actually talk to her class to be considered their favourite person.
Things that are terrifying enough to conceptualise someone having while having full knowledge of the Chara system. Saaya only has half remembered ideas of them, and that likely makes it even worse.
Saaya is, from what I can tell, a Sleepwalker of sorts. She's subconsciously aware that Amu
doesn't make sense within normal social structure, that she is passively altering the emotions and minds of those around her, but hasn't added it up to anything so specific as psionics.
She just knows, and has known for the last half a year by the sounds of it, that Amu is somehow warping the world and people around her, and that she's the only one that seems to notice.
Reality has been shifting around her for years, and she has enough resistance to psionics to know that something is wrong, yet not enough to actually keep her memories in full and figure out what's going on.
It was the sort of feeling you got when you were holding a not-wet-enough ball of sand, and it was about to slip away.
She's finally hit the point of being able to verbalise it, to lock it down enough for her consciousness to actually do something about the unending psionic attack that is Amu's passive.
Her latent Psionics, magic, whatever she has, apparently just weaponised in a crude manner to try and fight Amu back.
Saaya just burned all her social capital without caring. She's self sabotaging what she actually values in this attempt to finally push through the aura, both herself, and for the others in the class/school.
This is... pretty much Saaya giving up on reality actually working, that she can use reason against Amu. She's 'giving in' to the madness that she's been trying to solve with a half blinded mind. The blinders are coming off properly, and she's past caring about the consequences this will have on her mind.
If you'll allow the reference.
Grant us eyes, grant us eyes. Plant eyes on our brains, to cleanse our beastly idiocy. The grand lake of mud, hidden now, from sight. The cosmos, of course! Let us sit about, and speak feverishly.
Saaya's found a way to see what's really going on. Reality is suffering the consequences of someone
breaking, and reality hasn't been in the best shape recently to start with.