how does mariam endure?

That's a pretty good question. I really don't know how women like Mariam endured the unceasing domination of men like Rasheed. Mariam survives years of Rasheed's brutal and violent passive aggressiveness. I think Mariam finds comfort in Laila who, like Mariam, must also withstand Rasheed's abusiveness. Certainly the sisterhood of females, even wives of the same husband, kept women like Mariam alive and perhaps with a few stolen moments of happiness.