this is what i meant as a care giver,.. is you really have to give her the will to carry on,.. it is very hard to fight a battle when the wars are so hard,.. that is why your support is so vital, you have to keep her focused,... if the roles were reversed you'd probable feel the same as her after a while,.. its a menacing disease, that wears on the both of you as to divide and concur, type thing,..
keep the faith, and try to see things from both sides, this can help you later on,..
just you brightening her days will help her most,.. taking her mind off of the tiresome, fight can help a lot,.. it rebuilds her mental strenght,.. to fight another day