God’s grace and strength to you and her family (and to her, too.)
I wish my mother could accept my comfort for the loss of a sister’s husband whom we all loved. I have no reason to believe he died a ‘Christian’ in any formal sense–as far as anyone can tell he was on the atheistic side of agnostic. But he was clearly a sheep, so I have no worries for him.
(And if he had just as clearly been a goat, I still would have no worries for him, though in a slightly different way. 
)
I worry about our families and friends left behind, not about those who have gone on ahead. If my most beloved died, I would probably just go catatonic in grief–not out of worry for her, but because I miss her so much, and also out of grief for the pain shared by others who love her. Not that I wouldn’t grieve for the loss of others I love, but naturally she’s the standard. Thus I can sympathize better with others who also lose one they love; and can pity better those who die without one behind to be torn by the grief of their passing.
The vale of separation is a terrible veil to bear. God grant the day come soon, when that veil is at last torn completely down, and we walk in the valley of the shadow of death no more–to see with our eyes, spiritually as well as physically, those who have passed the veil before.
