I used to think she was an idiot for that, another user on Lemmy challenged me and I looked into the comment further.
The protestors she told to go back to China were members of Code Pink.
Code Pink used to be a legitimate feminist anti-war protest group, but after the co-founder married Neville Roy Singham in 2017, a Maoist who has supported pro-China groups across the world with funding ties to the CCP and now accounts for 25% of the groups funding, the group has suddenly removed all historical complaints against China and stopped saying anything critical of China.
tl;dr: This group is openly an verifiably funded by China, and repeats Chinese talking points.
In closing, fuck Nancy Pelosi and her governments support for funding Israel, but she was right on this single issue.