My gut tells me let her go back to the same rehab instead of a new one, in spite of their smoking policy. If she liked it there, she has bonded with the people and established relationships of value with the counselors. She needs the continuity and change is disruptive. there is something special about a place where we first get clean and learn about ourselves. I bet you she is better at following the smoking policy when she returns. Just my 2 cents.