I just got here from working in a farm 2 hours away and read your post. I'm very sad for your loss and pain, but I want you to know something very important: You can see your Mom again! It's God's promise in the Bible.
Do you trust Him? Would you accept the possibility that He gave her some rest and now He's concentrating in you to get you closer to Him?
I have learned in the Bible that God is love. I read some time ago that if we would be able to know the future, from the beginning, as God does, we would chose the plan that He's proposing to us today.
I'm praying for you and your family today. I'm asking my Lord to bless you in a special way so you know for sure He's with you, feeling the pain you feel also, because your Mom was one of His little girls, His daughter, and He had to suffer seeing her feeling sick and in pain for some time.
My brother, trust Him. I can recommend Him to you. I know Him personally and I know He loves you very much too.
Your brother Burt (a miserable sinner that received His grace and pardon, now depending completely from Him with gratitude).