Does a wife inherit anything from the estate of her deceased husband's mother, while the husband's father and siblings are still alive?

The wife inherits one-eighth of her husband's estate if he has a child, based on the Almighty's saying: "But if you have a child, then for them is one-eighth of what you leave, after any bequest you [may have] made or debt." As for the estate of the husband's mother, the wife does not inherit anything from it, because there is no reason for her to inherit from her husband's mother.