One way to think about it is that although she suffered some toward the end she had a purpose of being here to educate you and us through you. Also she comforted your mom - maybe if you had known ahead of time she wouldn't have been there to comfort your mom. Or maybe you wouldn't have gotten her at all as it seems these diseases are there from birth. She served her purpose here and you provided a safe place for her. Don't ever feel guilty, you in no way hurt her. You did not give her those diseases. Debbie