How long has her paw been this way? You may want to wait about a week to see if it improves. We've had this happen to a couple of our ferals and they got better in about a week. One we actually trapped again, took him to the vet, there was nothing visibly wrong or anything they could do, we released him and he was better in a couple weeks.

If the paw does not improve and she won't go in the trap, you might consider a drop trap.