>>31360550I'm guessing she decides the ways lyrics will flow. It was (and still can be) one of her downsides that she crams so many words into one line that it's like a blur and it's hard to do live.
Her earliest stuff was using premade beats, so she built her flow around those. Then she started making her own, or having friends do it, so she got more control over how the thing sounded as a whole.
Even with originals she's long had some consistent ways she used speed-up, slow-down, and she likes to insert little backing vocals which sound adorable (ayo!) Older stuff can be good but anything from this year has surpassed almost all of what she's done prior. It can be revisited and appreciated but the quality will be lower. Just keep that in mind.