I expect my fiancee to not wear her late fiances ring anymore
She is still wearing her previous engagement ring?
Yes, It is painful to look at the ring every time i think about it
You should ask your wife nicely about the ring. Ask her to pawn it and promise her you'll buy another ring with that money.
no.
Then what do you want her to do with it? She is not going to know that it bothers you if you do not talk to her about it. You cannot avoid it forever.