Sorry to hear, cancer is a horrible thing to go through. Just suround her with positive attitudes. Dont harp on the bad things. Think of the good times, talk to her even though it seems pointless. She hears you she just cant repsond how she wants to and she needs your support and the family.Stay strong, even though she has been diagnosed it dosent always mean the worst.
If you are wondering how i can say this,I have been through this alot.
I will keep her and your family in my prayers.