Hi Wayne,
Thanks very much for your input - much appreciated!

I have had a chat to the SPCA here - they have said that they would prefer if I caught her now. She can then have the kitties at their facility - they will put her in a separate room with a small outside "run" and monitor her through the delivery. They will then spay mommy and fix all the kitties and try find homes for them. I am OK with this, as they have a strict policy of never destroying a healthy animal.

I have told them I will pay for Mommy and kitties until they are homed.

So hopefully this one will have a happy ending!