Hello caitlynB.  This must have all been a shock to you when you thought she was doing well not so long ago.  It is difficult enough to lose a loved family member even when you have been aware for some time that they do not have much time left.    I don't know if it will help but I am attaching some information from this website about grief some of which may make sense to you.

about-cancer.cancerresearchuk.org/.../coping-with-grief

If your gran has been fighting cancer for some time now it may be that her body just could not cope any longer.  So spend what time you have with her, tell her how you love her.  She may not respond but can still very likely hear you.    Best wishes.  Annie

Hi there, it's  a horrible situation to find yourself in but you don't need to"cope"  with someone dear dying,  it's not an every day occurrence so just go with how you feel.  It's   alright to feel sad, scared,  angry these are human emotions and help us work through trauma and grief.  Your Nan knows you love her and being there with her will comfort both of you.  My Mum took a week to fade away and I held her hand and talked about old times, hearing is the last sense to go so she will be aware of you being there. Cry and grieve properly for her, don't hide your feelings and it will gradually get better and you will remember the good times you had.   I hope this helps a little.x Carol

Thank You very much. It took her 3 hours to properly die. She started not being able to breathe well etc. I will make sure to read the post you linked.

Dear Caitlyn

Im so sorry to hear of your pain. I can relate to these circumstances, my own nana passing from Ovarian Cancer. I went through the same emotions but I sat with her, held her hand, i cried with her even though she was sleeping, i whispered all the things i felt for her to her and even when i was alone and after she went, i cuddled her and told her i loved her. It felt very very sad, heart physically hurts....but I had her for as long as I did and i was happy for that. Time will help you...you wont forget but you will learn to live with it and be happy again. Just be with her x