Welcome newbie, you have figured it out. That is why you remember 1 of the commandments.........Don't chase surges!
I don't think it will surge for that because she's already involved in a trip. But it may be there to keep you out in that area.I once got a ping with a woman's name and went to the location and the rider turned out to be a young man so I drove him from Alpharetta to his destination out in rural Milton. After I let him out I checked the map and I noticed a surge around his house so I think it was just his mom sitting at home watching the trip.
The surge cloud was small and centered on the ride requestors property and barely covered the neighbors, it may not have been from her monitoring the ride but opening and initiating the request from there. Regardless of what caused the cloud it was obvious to me the surge would be fruitless so I didn't hang around. I just keep that trip in mind when I see a small surge 10 min away in a dead area.I don't think it will surge for that because she's already involved in a trip. But it may be there to keep you out in that area.