She isn't a patrol, that's for sure. That said, she's also not interested in watching someone drown in their own literal misery - particularly not when he's one of the first (and the few) signs of human contact she's found. A drop of water in the desert.

"Oye, vaquero!" Called out from over his shoulder, footsteps cautious as she tests the ground itself to be sure it isn't going to have the same affect on her sanity the way it's seem to have done to him.

So far so good.

"Can you hear me?" Can you see me might be the more appropriate question, considering the way this nightmare seems to function, but either way, Sombra's certain she'll find out soon enough just how conscious— how connected to reality— he is.