I can see her rationale, but let me drop a reality bomb here.
America right now, under our current leadership, is weak. If we pull out of NATO, JUST TO AVOID a war with Russia, that comes off as so weak, so terrified, that Russia can roll over us and leave us in the dust of history, while Russia surges forward as the new world superpower.
The only reason Russia hasn't done it yet, is because they are still afraid of us to the point that they won't make a war with us.
So yes, avoid a war with Russia, but no, do not pull out of NATO and look like a pussy.