Totally understand, there is a tendency with the Western left to idolize the CPC, which kinda makes sense. There isn't really an alternative except maybe Cuba, Vietnam, and DPRK. Those nations are also not in a position to really influence the positions of global capital.
There's also the fact that Marxists who don't live in China don't have to interface or deal with the domestic issues that come up there. All they have to interact with is the foreign policy of the CPC, which is significantly better than any other country (at least any country with a similar GDP, Cuba and even DPRK both do fantastic work with aid programs given their size).
I'll always be critically supportive of Chinese governance with the knowledge that many of their decisions arise from the conditions of China within the global market system and the reliance of China on access to that system. We can hypothesize about how things would be different if the Sino-Soviet split didn't happen and the entire East was unified under one socialist market that drarfed that of the west, but that's not the reality.
The reality is that China until recently had a relatively small domestic market for light industrial goods and developed their economy through export of labor and import of MOP. The current factor that we need to pay attention to is how the CPC transitions that model as China's internal markets develop to the point where they don't need to rely on export and can entirely function as a closed loop.
At that point, the need for "reform and opening up" will be basically gone except maybe for dealing with third world nations still shackled to the Dollar, but as the B&R continues to be built, those nations will be able to more easily divest from the dollar market and subsist on Chinese trade routes that honor their local currencies.
So yes, I agree that there's issues and that if things stagnate where they are then China and the CPC run the risk of backsliding into revisionism and a new form of capitalism, but as of now the pieces are in play that could absolutely be used to cast off that system. All we need to watch out for is how these programs and policies actually play out.
This is absolutely just her drumming up a case for intervention. She sees China's B&R as an existential threat to the US and see the entirety of South America as nothing more than raw material.