Trapping before demolition

I've been helping with a colony whose spot is about to undergo massive construction.  There remains one female to TNR, but she has gotten herself out of a trap 3 times.  We also want to relocate a couple and one or two may be tameable.  The clock is ticking so we went last night.  Frustratingly, there were almost no cats to be seen, perhaps it was the wind.  Of course the female would go nowhere near the trap.  Finally after an hour and a half of standing out in the cold, we managed to trap one of the cats we wanted.  

These situations are heartbreaking, yet another example of why we work so hard to get the kittens and tame ones out and TNR the rest, you never know when even a seemingly stable site can be sold and suddenly the cats are in peril.