Should I stop being friends with this girl?

Well she is toxic but she is also friends with my friends. Basically for some reason she started ignoring me. I keep trying to initiate conversations with her 6 times in a span of a year but she keeps doing the "seen but no reply". One guy said she's busy BUT she posts on instagram her smash ultimate matches and her animal crossing stuff. She even likes and comments on peoples' FB posts. What's so "busy". She asked me one time to answer her survey but I did the role reversal. She told me she needed me because her scope was small and I was part of it.After my 3rd ignore she gave a long ranting message of how I'm a bad friend. I replied back telling her she kept ignoring my messages 6 times but she kept telling me she was busy but I told her I saw her instagram posts of Smash and animal crossing and also she likes and comments on FB. She jsut stopped witjh the conversation and told me Im the worst friend. IDK what to do if one person among a friend group starts being toxic to me.