Seeing the photo/frame in the trash is horrible and I'm sorry you saw that. They like to replace all good things with bad as if good never existed. She's probably tossed it because she doesn't want to be reminded of any of the good times. Is guilt driving that, probably, but they like to distance themselves from the worth in the M.
Hope you have a good one.
Me 42, Wife 39; Married 16; Together 17; Kids: D13, S10 Wife asks for Divorce: 03/19/13 Reconcile: 07/07/13 Round 2 Starts: 02/19/17 Apartment Life: 04/21/17 PA Confirmed: 05/23/17