No she is a yonko, a pirate king competitor, that has directly fucked with Luffy, and that Luffy has personally said he will take her down.
Her crew are MIA, she has said she will betray Kaido, she now has half of Sanji's somewhat redeemed family held captive, the ongoing plot thread with the charcters from Elbaf is also in play. You can say she is of secondary relevance to this arc, but she was the first yonko Luffy came into conflict with in the post-TS, both over the phone and directly, and he promised Kat that he would beat her, as well as promising her she was next after Kaido multiple times. Kidd and Law have scaled back their ambition in this chapter to just stalling her from the roof.
BM losing before Kaido dehypes the feat of someone from the new generation taking down a yonko, her losing after seems kind of anti-climactic.