Re'Kha hid behind a tree as she looked at the carriage moving towards her. She intended to first trap the carriage, preventing it from escaping the place. Second, she planned to quickly knock out the three people on it so that the Blinded Ghost wouldn't be able to control them to hold its shell and flee.
If one of them managed to do that, then her trap would be useless. After all, her trap was the field full of Water Qi that gave her home ground advantage. While, every moment the Blinded Ghost was in this place, it would take damage.
Moreover, its shell too would be taking damage. So, as long as she ensured its shell was trapped in this place, it would eventually be destroyed. That was her plan. And, as the carriage approached her, she hid behind the tree, tracking the carriage through her Water Qi perception.