A woman in a US military uniform is writing on a large piece of white paper with a black magic marker while others are sitting at tables around her.
A woman is trying to write a letter to her daughter in the states
A letter is not always written on large paper with black magic marker. Just because she's writing on paper with a marker doesn't mean she's writing to her daughter in the states. Not all women have daughters.
It is not sure she is writing letter to daughter in the states
Just because a woman is in US military uniform writing on a piece of white paper doesn't necessarily mean it is a letter or that it is to her daughter who is in the states.  She could be writing or drawing anything there is no inference that this woman has a daughter nor where she is.