S.H.
Girls, cry. They go through lots of age phases where they are emotional.
Or it is their personality or the only way they know how to express themselves.
If she is crying or whining for NO reason, then tell her she can go to her room. And when she is done, then she can come out.
But if something is wrong, then talk with her.
I have a daughter. But I know... when my daughter is crying or whining for a reason. Or not. Or if she is just over-tired or hungry.
I know her cues.
She is 9 now.