It's not easy using the rope...lots of patience needed, but I've managed to catch entire litters with the mom cats included by doing so. Do you have any idea where the cat gives birth when she does? If she has kittens before you can trap her (and you know where they are) you can use her kittens as bait for her if worse comes to worse. Thing is, you have to wait it out for close to a week, otherwise she won't be bonded enough to go into a trap for them. Having the door tied open is a great way to get her less trap shy as well. Hopefully the trap doen't have the odor of other previously caught animals in it. Also be sure there's some sort of flooring for it. I use rubber car mats (with nubs on the bottom to prevent sliding) and make a trail of food leading toward the main course. They are easy to bleach, and leaving the mat in place allows them to leave their scent on it day by day. Keep me posted, and GOOD LUCK!