Natasha’s in the Korvac Saga, anon. See?
The Korvac Saga TPB cover by George Perez.
But I don’t blame anyone for not noticing. The Korvac Saga is more about Korvac than the Avengers, in my opinion. The most “classic” Avengers story that goes through Natasha is probably the Red Guardian arc, Avengers #43-44.