Omg...this is so touching. I was so emotional and close to tears reading this. I cant even imagine how you feeling now. Is sad to watch a love one go and you cant do nothing about it. But like you said, she has suffered a lot. The pains she must have gone through must be unimaginable. Dont know what to say, but i know Jesus gat her and your family.
I pray God give you the grace and strength to get through this time. I pray may her exit be painless...awww this is so emotional!!!!