Liz- just putting ideas out there. Try a bedsheet, and make it into a giant pillowcase and trap her. Or, if there is a fisherman in your area...get his net (they used the net with my mom's cat- he is very starchy) and trap her with the net. You would prolly need a guy to flip it up, as the pole length is usually too long for a female's upper body strength to hold up.

Hugs to you and Mama Kitty.