Well, it was the journalist who brought up Apple, not Warren.
If "breaking up Apple" in this context turns out to mean "make Apple spin off a very small part of their business", there's no reason to suppose Warren would be unhappy.
It's reasonable to suppose that Warren is making the recommendation she's making for the reasons she states, rather than inventing a pretext for an underlying wish to break large companies into approximately equal sized parts.
If "breaking up Apple" in this context turns out to mean "make Apple spin off a very small part of their business", there's no reason to suppose Warren would be unhappy.
It's reasonable to suppose that Warren is making the recommendation she's making for the reasons she states, rather than inventing a pretext for an underlying wish to break large companies into approximately equal sized parts.