Gyps, I know that you've put your whole heart into making this a correct decision, based on what's best for her.
It's a blessing to have these days to enjoy, even knowing what has to come. My friend T's dad (who passed away last week) was told the last week of April that he had only 6-8 weeks; a very unexpected and agressive liver cancer that wasn't treatable. Her family was able to fill those weeks with lots of love and memories and just time together, knowing that there was a limit to the time.
Make the most of your days with your girl. God's got his eye on you both.