I just saw that Minnie has passed away... This sent chills down my back and a gasp... VERY very, sorry for your loss. My heart aches for you and your family.
To me it is the not knowing why , is what would be the most difficult to accept. Minnie was with who loved her the most and passed peacefully. Knowing she had a wonderful home and the most love she could have is right now comforting.
You will be blessed for this, and hoping you may find peace in her memory.
