She's also very self-serving and has no sense of loyalty to other left-leaning politicians - else she might've backed Bernie from day one in 2016, instead of play things 'safe'. Her playing safe hurt her career more than anything else ever will in my opinion.
That aside, I don't think breaking up google, fb, amazon will do much...if I were to break them up, I think the only thing I'd do is perhaps have them split their cloud services from their other offerings, and maybe media services -- youtube | amazon prime video, but it's small potatoes.
I think a MUCH bigger issue is media consolodation -- when 1-2 CEO's control 80% of the media and thus the 'message' that people see, that's a much scarier proposition.
For example Sinclair Broadcasting I think owns something like 90% of local broadcasting stations now - and they send talking points and control what newscasters say in order to get political messages out - it's basically propaganda that they control, and it's very powerful esp in the wrong hands.
Comcast/nbc/hulu, att/time warner, disney/fox/espn/etc are all companies that probably are more dangerous than google/fb/amazon (w/ the exception that FB really needs to get it's privacy shit together or just die...), and if you're going after big tech why not Apple/Microsoft, Microsoft is as big if not bigger than it was when they had their antitrust case, Apple is the biggest company in the world ? Maybe we should also have a 25BN = auto-breakup for banks, since banks caused the last great recession, and are obviously dangerous when they get too big to fail.
Or maybe instead of breaking up companies we just figure out ways to tax them better -- esp. on speculation and at the investment layer, so that the money they make that 'you - the politician' feel they shouldn't be making is used for the benefit of society as well as enrichment of the CEO and their ilk.