Regina, Saskatchewan; Canada
I recommend trying all three things at once. Set up as many safe traps as possible. Leave good cat food out. And also stay out sometimes sitting in the open where she can plainly see you. If you try to ambush her, I don't think you'll ever be able to catch her. Because no matter how close you get to her, she'll most likely notice you before you get close enough, and when she does she'll sense something suspicious, secrecy, intent and she won't trust you, but just run away. But if you are in the open just acting normal, and not making any signs of intent or something that may suggest something aggressive to her, then I think she may be more likely to come up to you and you may be able to catch her. Hope that she comes back home to you.