Her stuff is always great.
I don't know music well enough, is this something you can learn or is this prodigy tier? Because it's like an Ear-Sharingan.
As far as learning this particular piece of music, it's actually not that difficult. Harmonically the song's actually not that terribly complex, in total it's maybe 6-7 chords/generalized note groups and the key/most basic note stays the same throughout. Notice her left hand on the base part doesn't move around much and often goes back to the same positions.
Rock music has relatively predictable cadences, i.e. particular sequences of chords that end/begin a particular musical section/idea like going from the verse to the chorus, so to even the moderately trained ear it's not hard to listen and predict what's coming next (also why she's able to pretty easily point out "this sounds very chorus-y" right when it happens). The melody also pretty much stays entirely with the same key, so knowing basic major and minor scales will get you through the relatively small melodic intervals/jumps in pitch from note to note. All that being said, doing it as quickly and effortlessly as she does comes down to having practiced a long time and having both a good grasp of music theory and a well-trained ear, and the time and dedication it takes to get to that level is for sure praiseworthy on her part. She's really good, don't get me wrong, also largely because mechanistically playing piano at this level IS pretty hard and she's doing this all with relatively few mistakes, but this video specifically is hardly prodigy-level stuff given the material she's working with. Given enough time this level of musical ability is certainly achievable.
Perfect pitch AND synesthesia? Holy shit
I wouldn't call this perfect pitch, though a really well-trained ear. And I think people in here have a misconception of what synesthesia is.
synesthesia is the experience of perception from two or more unrelated sensory modalities from the same stimulus, i.e. perceiving uncolored digits as colors or tasting a sound. EDIT: OK nvm I see in another she talks about having synesthesia.