Pro-Putin conspiracy theories notwithstanding, nothing I've seen suggests that Nuland did anything during the crisis of 2013-14 other than engage in random conversations with other American diplomats.
That Nuland may have mentioned some Ukrainians favorably in some of those conversations does not in any way constitute a "coup" or anything remotely resembling.
It was simply diplomats doing what diplomats naturally do.
Even if, somehow, Nuland's opinions became known to Ukrainians who then used her words like a campaign political endorsement, that still in no way constitutes a "coup".
At most it would be the equivalent of... take your pick... somebody in Canada's foreign ministry expressing their preference for, say, Biden over Trump.
That might sway a few votes, but it's still not a "coup".
Which is not for a moment to defend Nuland or anything she may, or may not, have actually done, I'm simply saying that Ukrainians themselves are in charge of their fate, not some US State Department underling.
Euromaidan Revolution in Ukraine, 2013 to 2014:
