Are you able to set up a cage or kennel to catch her?
The idea would be to set up kennel or cage with kitten in the very back of it. And food. Preferably wet food . Put a blanket over the kennel so it looks like a safe place. And wait. Usually the momma will come to rescue of the kitten and then you can close the door.
The idea would be to set up kennel or cage with kitten in the very back of it. And food. Preferably wet food . Put a blanket over the kennel so it looks like a safe place. And wait. Usually the momma will come to rescue of the kitten and then you can close the door.