Taking this off of my chest

As a Muslim girl, my mom and dad have given me pretty much the freedom to do anything. I know what’s forbidden and what’s not in my religion. I’m very much aware of the rules and regulations that apply in my religion. I believe in god and I pretty much help people and try to follow our rules as much as possible. During Ramadan I always fast and pray, but other times I don’t pray but I do listen to the Quran. I know how to differentiate between right and wrong, and I know the right and wrongs, but every. Single. Time. My grandma opens her mouth I just lose my marbles. Going on about how I have zero faith in god, how I’ll go to hell, “oh you won’t see the gates of heaven with those two eyes of yours” and keep in mind that this women. Is. Full on. Religious. Just because I don’t pray she just cancels out every other stuff that I do. I’m 24, my mom has been in another country for work for half a year now and I’ve been working tirelessly to provide for my brother and my grandma. If I have nothing to eat I’d be making sure to put food in front of both of them. My dad lives with his other wife (divorced parents) and I’m all alone. And have shit ton on my plate, stress, depression and so on and she goes on about this bullshit. If not every day, every 2 times a week she’ll throw that in my face. And I don’t know how to deal with it.