I know that many couples work all day and the truth is it's extremelly hard to keep up a relationship with such demanding hours. The fact that you have kept is so long must mean that both of you love each other.
To keep your relationship, why don't you take some initiatives, and try to communicate better with her. I think that you will need to talk these things over. Maybe there are different problems that need to be surfaced. And how about weekends or any vacation? Do you spend quality time together?
Also be very proud of her; very few people can have so much energy to do so much. Perhaps you need to give her a tap in the back for this. She should also for you.