Capitalism is simply a system where the ownership of capital is primarily by an investor class using limited liability corporations in a market system.
Given insufficient restraints, the investor class will act in their own interests - that is to say, calcifying their control over capital through the use of clientism and legal force, just as pre-capitalist aristocracies did, up to and including detachment from the market. Capitalist elites do not care about capitalism. Capitalism is the ladder (however unfair and cruel that ladder is, mind you) that they pull up behind them once they achieve success.
Elites always want to become an aristocracy, and given enough time and power, they will become an aristocracy in a society that refuses to confront them, and dismantle capitalism - again, itself not exactly a humane system - to implement an even more oppressive apparatus in its place.
Unfortunately, dismantling capitalism is easier than dismantling an aristocracy. If they succeed, the task of left-wing anticapitalists becomes harder rather than easier.
Will she fight for them, or will her GOP affiliation win out?