Eh... she's protesting the more right wing part of the government winning an election. Seems fine to me.
Russia is useful for destabilizing the Western dominated world order, but is definitely not a "friend" of the left.
Edit: (gonna leave my comment here, because I earned this)
Woof, fucked a hornets nest on this one didn't I?
My intent, ultimately wrongheaded as I may be, was to wonder why we care about Greta Thunberg taking a side in this. I wasn't aware she was more than a minor celebrity based on climate change stuff and has enough... I don't know... influence to draw more outside support for this attempt at a color revolution. This feels likes something for The Dunk Tank and not News.
Sure, she made some negative statements about US imperialism, but that's pretty low hanging fruit. Its the easiest thing in the world to do when there's a flag to identify who is doing what. But can completely understand why it might be much harder to see what's likely going on when the flags are the Georgian flag and the Russian flag, especially when you're in your early 20's.