Yup!

Keep them in the trap to take them to the vet. Even if the cat has to go without food for a full day, it is safer for both you and the vet.

I don't even set the trap on Friday or Saturday nights because I know I won't be able to get the cat to a vet over the week end.

You might talk to your vet before you set the trap to see if they can 'squeeze in' a feral if you do catch it.

And yes, please be sure there are no young babies that will need her while she is in captivity. It might be better to wait until the kittens (if there are any) are old enough to eat on their own.

Then scoop them up too!