When Vision first died, half the planet went with him, including Wanda. When they came back there was shock and grief a plenty for everyone.
They were all grieving Tony, and Natasha at that point, and the people that knew Wanda best (Steve and Tony) were both gone.
Clint was significantly grieving, and Thor was a goddamned mess. People get wrapped up in their own shit. The eternals didn't have lives outside of each other until the end.
