Active voice of "Her face is being washed by Huma".

Huma has washed her face.

Huma will wash her face.

Huma is washing her face.

Huma washes her face.

The passive sentence "Her face is being washed by Huma" is converted to the active voice as "Huma is washing her face".

It indicating the subject (Huma) is performing the action.