Bob has a yellow 2 on chop, which would normally need to be saved, but Cathy already has the other copy clued in her hand, so Bob's yellow 2 is trash and should be ignored.
Bob has two 5's, but neither of them are on chop, so they cannot be saved yet.
Cathy has two 5's. One of them is already saved (i.e. has a clue on it), but one of them is not already saved and is on chop.
(Her chop is slot 2 because the cards on slot 3 and slot 4 have a clue on them.)
Donald has one 5, but it is not on chop, so it cannot be saved yet.
Thus, Alice should clue number 5 to Cathy as a 5 Save on the yellow 5.