There is no evidence that she doesn't "need" the citizenship - as you yourself say, EU citizenship is more valuable than the Russian one.If she doesn’t need this citizenship now, if her actions discredit Lithuania, then why can’t Lithuania return the status quo?
My question is easy - is Lithuania a democracy? Then they better be tolerant to difference in opinions. Fine her all you want, but this is akin to exilement, and makes an absolute farce of the concept. What they're doing is no better than Russia and China.