If my sister is married and she always has economic problems, but she’s not poor, but sometimes she don’t have money for example for the doctor. What is better to give my maaser to her or to any normal poor.
If she always has economic problems, and is generally needy, it is best to give her your ma’aser money.
One of the principles that defines the order for giving charity is “family first,” and this will apply to your case.
For further details on who is entitled to receive charity money, please see here.