If a married couple separate but don't get divorced the female then lives with another guy and has a child who would inherit money left to the female in a will but she dies before the will is read?

In this scenario, if the married couple has not divorced, the female remains legally married to her spouse. Generally, her spouse would inherit according to the terms of the will unless the will specifically states otherwise or if the state law dictates differently due to her separation. The child from her relationship with another guy may have rights to inherit from her estate, but this typically depends on the laws of the jurisdiction regarding intestate succession and whether the child was named in the will. It's advisable to consult a legal expert for specific circumstances and local laws.