She was near there Bev the day prior to the sighting and is the only transmitter falcon currently in this area - unless someone is not telling about theirs. The day she was at PC - coincidently they had problems with the transmitter and then 2 days later she was moving back to the US. Doesn't mean she tried to take over Treasure's site, maybe she just got caught up in the melee or challenged as she passed through the area. Carol posted that she was in touch the Doug and she's pretty confident it was Quest based on her conversation with him.
Three days ago she was here in Toronto near our site again - so she's moving around like crazy. The past week alone, she was in the US, in Hamilton, in Toronto, in Port Colbourne area again and back at Lennox Station.
The fact that an egg has been laid already - I'd be inclined to think it's still Treasure here as it was almost right away and there hasnt' been a period of getting to know you like you'd expect with a new female. Mind you, if you're in the mood - you might skip those pleasantries but seems more like a reclutch to me.
ps: Doug has also seen another tiercel in the vicinity so it's falcon central here! Now if Quest could just entice him back to to Lennox..then we'd have a new pair!