I caught my feral mama that way too. As it turned out, she was less than a week out from delivering 5 healthy babies. While in the end it all turned out fabulously, she absolutely flipped out when I shut my front door, with her on the inside! She literally bounced off of the walls! My daughter came to the rescue and created a shute with a cat carrier, and I don’t remember what else, and caught her under the dining room table.
She raised her spider monkey ninjas in our 2nd bath, with help from us handling them from day one. When the time came to find them homes, I hooked up with our local SPCA. For $50, they tested mama and her babies, spayed/neutered them all and I fostered the kittens until they had room. The babies were all adopted in a week. Their sweet, sweet mama was already home and is my love and my velcro kitty. She loves me and hides from everyone else.
She just had her 9 year gotcha-versary a few days ago, and is roughly 10 years old now. Her babies will be 9 on the 4th of July.