Honestly does it have more to do with ex Hillary/Kalama advisors or that she came off as a wannabe moderate lite and people saw through that? I only say this because the strategy clearly worked for Hillary in 2016 in terms of winning the primary season and is working for Biden with even less competent people running that campaign.
Warren always tries to be something she's not. She's not a moderate so her trying to shift so many of her original positions to please a certain electorate never made sense.