Feinstein doesn't tow the far-left line. That's perfectly reasonable even if they sometimes came be poor decisions that can merit fair criticism such as her Iraq War vote.
When her California colleague is one of the most liberal senators in the country and gets attacked by the left for being too centrist you realize they have a structurally problem. They don't gasp that politics is serious business, that you aren't going to get your way just as a child will be denied at points to not do something because his parents said so. Why does one negative contradict all of the good someone like Feinstein has done for Cali and America?
Of course she isn't a far leftist. Only anarchists and communists are.
But as we should expect from a centrist hack like you, you don't actually care about using the term properly and are just using it to mean "political positions I don't like."