Pelosi hasn't had fans in far left camps for years. She's been getting booed by the extremists for quite some time. She gets painted as a far left zealot because that's what sells (ever notice every election cycle whatever Dem runs for President is the most liberal Senator / Governor / etc) but really she's just your run of the mill political opportunist and that doesn't fly well with ideologues.
She's just damn good at spotting opportunity and exploiting it.