boiled, still warm, chicken livers! And warmed up turkey breast. Smooshed down on the trigger so she has to really go at it (instead of grabbing pieces and running out without stepping on the trigger). With a difficult cat, I finally caught her with a cooked chicken leg tied securely to the upper corner inside the trap so she'd have to lean forward and pull (step back) repeatedly till she finally stepped on the trigger! (Of course remove boned chicken asap!)
If she were still bonded to her kittens, you could use a kitten as bait but that is a difficult process and takes some know how (kitten in airline carrier up on it's end and completely covered except the part where mom can see kitten at end of the trap- you need bricks or heavy rocks to hold it all in place- and cover the part of mom's trap at the end) unless you have a very long trap with the fork divider. A mewing baby does it everytime but sometimes still takes a couple of hours before she's brave enough to go for it!
Keep us all updated!