A girl watches a woman, wearing a black apron to protect her clothes, cooking food on the stove top while another girl stands nearby doing an unknown task.
All are standing in kitchen.
All refers to the girl, the woman, and another girl. The woman is cooking food, which is done in the kitchen. Another girl stands nearby, so she is probably also in the kitchen. The first girl is watching the woman cook, so she must be in the kitchen, as she could not see the woman cooking from another room.
(-x)
(-x)