John Gill Commentary 2 Samuel 13:19

"And Tamar put ashes on her head, and rent her garment of divers colors that was on her; and she laid her hand on her head, and went her way, crying aloud as she went." — 2 Samuel 13:19 (ASV)

And Tamar put ashes on her head
In token of sorrow and distress; see (Joshua 7:6) ;

and rent her garment of divers colours that [was] on her ;
signifying that her virginity was rent from her in a forcible manner, or that she was ravished:

and laid her hand on her head ;
through grief and shame; see (Jeremiah 2:37) ;

and went on crying ;
from Amnon's house to her brother Absalom's, as one abused and injured.