She manages to create an intensely poisonous jungle/marsh around her, which extends partially into the fenced-in area.
quote:
how they know where she is
In this case, it's fairly likely to simply be sight.
So she manages to create a passage in a faery ring which grew up around an old stump when she created the jungle.
The fae world of this universe is dead. There is no life, only the skeletal remains of variously sized fae and mythical creatures. Even the color is drained out of everything, leaving the fae world grey and dismal. As long as she explores this fae world, she'll find nothing but skeletal remains and crumbled ruins. Even the castles of the immortal fae have fallen and decayed. There aren't even living plants.
But she is not being followed any longer.
Back in the physical realm, hundreds of soldiers are going to search the new jungle for days before giving up. Many of them will die by the Chaos enhanced poisonous creatures and plants.