So glad cute Socks found a home!
I've heard people managed to get feral mother cats TNR'd by having their kittens in a carrier close by. I think it's worth a try of all else fails.
Addendum to my above note - the "buddy trap" concept HAS worked for me before!
Please hang in there, Trudy1 ! Yes, you have invested more than time and efforts in caring for your colony; your efforts have paid off, too.
My heart goes out to you, I have placed many 'families' too, and we have to believe it will all work out and they will be happy again. You are depressed, that is a normal reaction. You love them and want what is best. I'll pray for them all, you will be blessed for opening your heart to them, and going above and beyond to help them. Thank you.