A lot of her songs began life in loop-based music editors (which operate by mixing sampled recordings of beats, riffs, bass lines, melodies, etc., rather than traditional notation)
Tell us you don't know anything about Taylor Swift without telling us. You don't need to do any guess work here, there's a lot of behind the scenes "making of" footage out there. Most of her songs being in her head, and then get punched into piano keys or strummed on guitar strings while she takes note in an old fashioned pen and paper style notebook.
Virtually none of her music is loop-based, virtually none of it is sampled. And calling someone who expertly plays 8 instruments and writes all their own music not an "actual musician" isn't an insult to her, it just demonstrates what a loser you actually are.
I don't like Taylor Swift's music, but will happily defend her from being shat on by ... wait didn't she write a song about you? Haters gonna hate or something like that?