I thought isis hated seth that she wanted him to dead???

He hates him cuz she cannot accept the sins that osiris has committed and it’s one way of making seth the sole villain so that she doesn’t need to acknowledge osiris’s lack of love and faith and all the shit he did. But isis does love seth, they were the closest siblings out of the 4 and had a good bond. It’s complex, but beautiful.

At the start way more but some chaps before this she tells Horus that Osiris isn't trustworthy and he destoryed everything, you can also notice her approach towards Nephthys change very slowly