I know the other game modes are not considered when designing a champion or... well, ever actually.
But I and others quite enjoy them, whether it's Dominion, ARAM or Treeline.
How do you believe her tunnels being visible at all times and destructible will affect her usage on those maps? Cause right now, I can see her being pretty okay on Scar, but useless on Abyss. It's a division of free-roam compared to extremely confined movement; opposite paradigms to say the least. In addition, I don't see her doing well on TT because so much of her power budget appears to be claimed by the "tacticalness" of her R. But then, she can already jump over (or I guess, dig under) walls.
Her "I can theoretically return to any point I've been to previously" doesn't matter nearly as much on the smaller maps, and especially on Abyss where the enemy literally walks over every point of ground to to reach the frontlines. The only times it could be useful is diving far behind the turrets and nestling it against the NW or SE base walls, or during the exceptionally late-game scenarios when death timers win or lose games.