As the tree is yellow due to the autumn season as it is mentioned that it was the time of the afternoon and colour of goldfinch is also yellow .So,her identity is not clear as she is mixed with her surrounding the phrase "her barred face identity mask "please tell me can i use this answer of the ques. that is what does the phrase 'her barred face identity mask' mean?
The bird mentioned in the poem has black markings similar to a mask. Looking beyond the physical, it seems to refer to the fact that her family sees her as she truly is. Throughout the day she may wear many masks, however, it is impossible to hide one's true self at the end of the day.