Her negative zone power says she ignores terrian when making ranged attacks.

How about barrier markes? They are terrian markers, not simply terrian.

We are playing now, so thanks for any input

Barrier makes Blocking Terrain. You place the markers to indicate blocking terrain.

I'd say she ignores it. Terrain is terrain, whether part of the map, or generated by a power/ability.

I call shenanigans. Me and the army of Trapsters.