How can I help my mother who is still grieving her sisters ?

[NadaTeTurbe]

Hello, y'all. 

My mom lost her sister, my aunt, last year, in february, after a cancer. It was hard for my mom, because she was very close to her, and it left a hole in her life. 
Next week, we are going to see my uncle (the widow of my aunt, who already have new woman (he was with her before my aunt died...)) and my cousins (and their new baby !). It's hard for her, it's the first time we are coming back to Paris, and we are going to sleep at my uncle's house, with (maybe) his new woman... 
My mom is sad since this. On the outside, she's all smiling about meeting the new baby, but since we know we're going, she's always sick, and it have been 3 days since she have not take a true meals. And sometimes she is nearly crying. My father is nice, but he see nothing. 
I'm praying for my mother, I try to help her in the house, but I don't know what to say to her. I think she need someone to say her "I understand you", but I'm not good at touching speech. But I want to help her. I can't speak about God with her because she's atheist. 
Have any of you be in this situation ? What can I tell her ? What can I do ? 

[truthfinder]

Grieving is always very personal, and many people do it differently.  Sometimes it just helps to acknowledge it.  Your family dynamic doesn't help the situation, and she might feel guilty about still feeling sad.  I'm not entirely how I'd say it in this situation, but even just noticing that both emotions are valid might help "It feels so weird to be happy and sad at the same time."

[Luigi]

You've already answered your questions, at least partially.

Maybe say, "I think I understand some of what you must be feeling," even if you're not good at touching speech. "I know you miss Aunt Clotilde because you were so close." Then you can ask some general questions - Are you nervous about going to her house? Should we make a back-up plan (for a hotel) if you're not comfortable there? That kind of thing.

You won't really have to make any touching speeches; mostly you will let her talk.

[CatherineM]

My Mom outlived both of her younger sisters.  She focused on good memories.  If your Mom is stuck, remind her of a funny thing your aunt did, or ask her about your aunt as a child.  A story you can save to tell your kids kind of thing. 

[NadaTeTurbe]

I asked mom if she did not felt strange, and then we speak about my aunt. I gave her a book written by a priest about hapiness - he doesn't speak too much about God. I hope it can help her. Thank you for your answers, all.