She's not a socialist and has made it clear she is a capitalist when discussing differences between her and Bernie. Issue with Warren is that big dem donors don't like her or her policies. Flip side is that she can raise money, and her fundraising base could help propel Biden (who, to be fair, is raising a lot of money on his own right now).
Some big Dem donors like Warren though
They just got scared she was trying to out-Bernie, Bernie for a time in the campaign