Should the FBI charge the bombers widow?

What did she know? What did she see? Is she in danger?  The FBI is still silent when it comes to bombing widow Katherine Russell and whether she is helping them on investigation.  Mrs. Tsarnaev  could have information on the possibility of a terror cell and whether her husband was involved in a triple murder on the ten year anniversary of 9/11. It remains unknown if she ever contacted the FBI once her husbands photo was released.  It also remains unknown when was the last time she spoke to Tamerlan. She remains living with her parents in North Kingstown Rhode Island.