Her response at the Grammy's was directed to young women about not letting other people undercut your hard work and taking credit for your "fame". Once Kim released the video of the phone call showing that Taylor was all aboard that concept of the song it all became about the word "bitch", which was the only word she could go to at the point due to not being mentioned in the call. Considering the context of the word in the song, along with Taylor being a big hip hop fan who has recorded with other artists who also use that word often in the same context. It really came across as phony and playing the victim. She pivoted.
Edit: just wanted to note that I'm not defending the use of the word "bitch" as a term of endearment in hip hop.
Also doesn't help this was followed up (or just preceded by?) by her whole (admittedly, accidentally) taking an artist's artwork and never really rectifying the situation thing. Really wouldn't have been hard if this was her stance to help rectify the matter and offer the original artist a bit more support.
Not so much her pose or anything, but just the actual art design. The first thing that came to mind when I saw it was Nas' album covers (the font, the photo of her face). The text on the right looks like something I could see Kanye doing.