Loki Disney Plus - Trailer

Wasn't Echo one of the villains from Hawkeye? I don't know her comics backstory and I apparently missed something in Hawkeye (though I saw the whole series).

Was the character Echo somehow redeemed enough in Hawkeye to "go hero" in a new series? Or is she going to be a morally-ambiguous figure (at least in the beginning)?

In D&D terms, I knew Echo wasn't chaotic evil, exactly ... but neither did I think she was riding that knife's edge between good and evil and could convincingly just switch like that. I do realize that her Hawkeye series backstory was crafted to elicit some sympathy and justify her motives.